Science – Amazing Facts 4 u

Guinea Pig

Amazing Facts 4 U — Mon, 30 Mar 2026 09:30:36 +0000

35 Amazing and Interesting Facts about Guinea Pig | Amazing Facts 4U

The guinea pig was domesticated as early as 5000 B.C. in South America as a source of food. They were also used in religious ceremonies and in traditional medicine. They have been kept in households as companion animals since being introduced by European traders in the 16th century.
The scientific name of the guinea pig is Cavia porcellus, which means “little pig.” They belong to the family Caviidae, which is a family of South American rodents. They are also not from Guinea; they originated in the Andes.
Guinea pigs may have been called pigs for several reasons. For example, they have a similar squeal to a pig’s. They are also somewhat built like a small pig, with a large head, stout neck, and no real tail.
While guinea pigs are not from Guinea, it is possible “guinea” was included in their name because they may have been sold for a guinea (English coin). Another theory is that Europeans may have believed guinea pigs came from the African country Guinea since ships carrying the furry mammals from South America often stopped there before going on to Europe.
Male guinea pigs are called boars, females are referred to as sows, and young ones are called pups.
If a female guinea pig is uninterested in a male during courtship, she will sometimes squirt a jet of urine at the persistent male.
The gestation period of a guinea pig is about 70 days. A female guinea pig (called a sow) is able to produce a litter of up to 4 young guinea pig pups.
The amazing fact is that if a female guinea pig does not give birth before she is 6 months old, her pubic bones will fuse. If she tries to give birth later, the fused bones will prevent her from giving birth resulting in the death of the mother and the unborn pups.
Guinea pigs have a high maternal mortality rate of about 20%.
Baby guinea pigs are born with their eyes open and are covered in fur. Baby pups are able to drink from a water bottle and can eat hay within hours of being born. They can run only 3 hours after being born.
Guinea pigs in fact have 3 toes on their forefeet and 4 toes on their hind feet.
Guinea pigs have a long and detailed history of being used in medical research from the 17th century. While rats and mice have become more popular test animals in the modern era, guinea pigs are still used as subjects for juvenile diabetes, tuberculosis, scurvy, and pregnancy complications.
There are two general categories of guinea pigs: long-haired and short-haired. Short-haired guinea pigs are typically easier to care for than long-haired ones.
Guinea pigs typically live about 4 or 5 years, though they may live up to 8. The longest-living guinea pig on record was Snowball from Nottinghamshire, England. She died at the age of nearly 15 years in February 1979.
Guinea pigs don’t have to sleep for long periods. They prefer to take short naps throughout the day and night.
Guinea pig ears are very sensitive to noise and they do not like any loud bangs.
Guinea pigs can hear sounds of up to 40,000 to 50,000 Hz, and some guinea pig vocalizations are ultrasonic at above 20,000 Hz.
Guinea pigs are particularly vocal. They have a range of vocalizations to communicate with each other, including ‘purring’ when content and ‘chirping’ when stressed.
Guinea pigs can’t sweat like humans can and so can get heatstroke if they are left out in the sun or become too hot. They have to find shade whenever possible.
Guinea pigs have what is known as “open rooted” teeth like rats which constantly grow to require them to constantly grind down their teeth while eating food keeping them properly aligned.
Guinea pigs will eat all day and night.
They do not bite in self-defense and will only bite because they think your hand is food.
Guinea pigs have a very good field of vision and are able to see around them so as to detect predators. The amazing fact is that they can’t see anything straight in front of their noses which means they don’t see what they eat.
The American guinea pig is one of the oldest breeds of guinea pigs and is considered the “classic guinea pig.” One of the most commonly found, it is an ideal pet for children because of its short, smooth fur.
Guinea pigs typically run a higher temperature than humans, at about 101° F. Their high temperature places them at increased risk on hot days or when they’re exposed to direct sunlight.
After about 4 years old, guinea pigs are usually considered senior citizens, and genetic health issues usually appear at this time.
Guinea pigs are very social and are truly happy only when they are together with other guinea pigs. Even the most loving human cannot take the place of other guinea pigs.
Because guinea pigs are so social, it is illegal to own just one in Switzerland.
When you are holding a guinea pig, the way to settle it down if it’s wriggling too much is to bring your hand under its back-side and amazingly it will stop wriggling.
A recent study found that children ages 5 to 12 on the autism spectrum showed a marked decrease in stress while interacting with guinea pigs. The pet could act as a “social buffer” for students with autism who may have difficulty making friends.
Guinea pigs are fragile creatures and so need to be treated with gentle hands. If you are rough, you could break its bones. In fact, they have a total of 258 bones in the body.
Amazingly guinea pigs always march in single file, with the largest guinea pig at the front and the young protected in the middle.
Guinea pigs have been found to be allergic to penicillin.
Guinea Pigs have excellent spatial orientation and are able to learn complex maze tasks using symbols as signposts.
Like humans, guinea pigs are unable to make vitamin C and need to acquire it through food sources. Failing to do so can lead to scurvy and eventually death.

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~ By Amazing Facts 4U Team

Supernova

Amazing Facts 4 U — Sat, 28 Mar 2026 09:30:29 +0000

30 Amazing and Interesting Facts about Supernova | Amazing Facts 4U

One of the most spectacular events of our universe is the Supernova explosion. It is the most powerful explosion known to humans. It is nothing but a stellar explosion being an explosion of a star.
The explosion is so massive that briefly, it outshines the entire galaxy in which it explodes.
The amount of energy radiated in one supernova explosion so much that it equals the amount of energy that has already been radiated by our Sun plus the energy that it will radiate for the rest of its life.
A supernova is so bright that it literally takes weeks and sometimes months for the brightness to fade away.
During a Supernova explosion, luminous radiations are burst out and almost all of the material of the exploding star is expelled into outer space.
The material that is expelled from the exploding star travels at a very high speed of 30,000 km per second.
This explosion sends out a shockwave in nearby outer space referred to as interstellar medium which is defined as matter that exists in space between stars within a galaxy.
As this shockwave travels through this interstellar medium, the gas and dust from the exploding star are bound by the shockwave and it continues to expand. This expanding structure is known as a supernova remnant.
Every time a supernova explosion takes place, the interstellar medium is enriched by elements of higher mass.
Not every star explodes. Our Sun will never explode. Stars that are about 10 to 100 times bigger than our Sun eventually explode and create a supernova explosion.
When a massive star eventually runs low on hydrogen (the fuel that is converted to helium through fusion reaction), the remaining hydrogen pushes outwards towards the shell, surrounding a helium core.
When the hydrogen moves to the outer shell around the helium core, the star becomes unstable and the outer shell is enormously inflated, converting the star into a red giant.
At this stage, the hydrogen in the outer shell of the red giant still fuses into helium producing thermal energy that wants to expand the star.
The helium core on the other hand exerts gravitational pull attempting to crush the star.
When the remaining hydrogen burns out, the gravitational pull of the helium core wins and helium atoms start fusing to form iron atoms, thus forming an iron core inside the helium shell.
Eventually, the core becomes too heavy and cannot withstand its own gravitational pull and the core starts collapsing. This is when the star explodes to form a supernova.
Supernova explosions also take place in what is known as binary star systems. A binary star system consists of two stars one of which is a carbon-oxygen white dwarf. The other is known as the companion star.
In this type of star system, the white dwarf (which is actually a star close to its life’s end, eventually collapsing into a small size almost similar to the size of earth) is known to be a thief. This white dwarf steals or draws matter from the companion star. This happens because of the enormous gravitational pull of the white dwarf.
At some point, the white dwarf ends up accumulating too much matter. This excessive amount of matter eventually causes the star to explode violently, resulting in a supernova explosion.
Supernova explosion shoots out billions and billions of atoms in every possible direction and they form colorful nebulae.
The exploding star may end up as a black hole and a nebula. However, if the star isn’t really a big one, the supernova explosion will end up as a neutron star and a nebula.
The expanding supernova remnant can produce enough kinetic energy that can compress the highly-dense molecular clouds in the interstellar space and form new stars.
Supernova explosions of supernovae are the primary sources of metals in interstellar space and till date, they remain known as the only dominant mechanism for the distribution of heavier metals that are usually formed inside a star during its life through nuclear fusion reaction.
The last known supernova explosion in our galaxy Milky Way was SN 1604. Astronomer Johannes Kepler started observing the supernova on 17th October 1607 and hence, it is named as SN 1604.
The latest observed supernova was in Andromeda Galaxy in 1885 and is known as S Andromeda.
The first stars of our universe became supernovae around 14 billion years ago. Our sun is not big enough to become a supernova.
Elements like carbon, iron, silicon, nitrogen, and oxygen that we find on Earth actually came from a supernova.
During the explosion, elements like uranium and gold are formed because of the extremely high millions of degrees of temperature caused by the explosion.
In 1054 AD, Islamic and Chinese astronomers observed and documented a supernova. It was so bright that it was visible in broad daylight.
The Crab Nebula that we see today is actually a result of the supernova explosion of 1054 AD.

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~ By Amazing Facts 4U Team

Radiation

Amazing Facts 4 U — Fri, 20 Mar 2026 09:30:07 +0000

30 Amazing and Interesting Facts about Radiation | Amazing Facts 4U

Radiation is the energy that comes from a source and travels through space. When this energy passes into the body, either by penetrating skin or being swallowed or inhaled, it may be harmful. Whether the radiation is ionizing or non-ionizing will influence the health risks.
Sources of ionizing radiation include nuclear weapons handling and detonation, nuclear plants, x-rays, etc.
Non-iodizing radiation is low-energy radiation that includes radiation from sources such as sunlight, microwaves, radio frequencies, radar, and sonar.
Radium, a radioactive element was discovered by Marie Curie who in fact died from radiation exposure.
Millirem is 1/1000 REM, a unit to measure radiation.
The loss in life expectancy from a 1 millirem dose is about 1.2 minutes, equivalent to crossing the street three times, taking three puffs on a cigarette, 10 extra Calories for an overweight person.
Nuclear power plants are very safe. In fact, the safety limit for exposure is just 5 millirem.
The average radiation exposure due to medical diagnostic procedures is about 80 millirem per year.
People in America living near coal-fired power stations are exposed to higher radiation doses than those living near nuclear power plants.
Chest X-ray gives off about 30 millirems of radiation.
The average person absorbs about 300 millirems of radiation per year in total from background sources.
1% of static on an untuned analog TV is from cosmic background radiation from the Big Bang.
The thorium-rich sands of Kerala, India give off 380 millirems per year, and similar sands in Guarapari, Brazil give locals an amazing 600 millirems per year.
Residents of Denver, Colorado get about four times as much cosmic radiation as those in who live at sea level, giving them an extra 115 millirems of radiation per year.
The Manhattan Project secretly tested the effects of radiation on its own citizens, including injecting pregnant women with radioactive mixtures and feeding children radioactive oatmeal. In the end, about 1,400 children died due to these experiments.
During the Manhattan Project, a man was injected with Plutonium without his knowledge or consent and he survived it for 20 years, eventually surviving the highest radiation dose known for any human.
Bananas are slightly radioactive and eating a banana exposes a person to radiation.
Because of the amount of granite used in its construction, the Grand Central Station of New York City produces more radiation than what is allowable at a nuclear power plant.
Astronauts on the Apollo missions reported seeing flashes and streaks of light when they closed their eyes. This was later confirmed to be caused by cosmic radiation bombarding their retinas while outside of the Earth’s magnetosphere.
All the American flags placed on the moon are now white due to radiation from the sun.
In the 1950s, there was a toy called the Gilbert U-238 Atomic Energy Laboratory that came equipped with low-level radiation sources and four Uranium-bearing ore samples. It sold for $49.50. The product stayed on the market for only about a year between 1950 and 1951.
The Chernobyl Nuclear Power Plant disaster was huge. It is still giving off radiation, and that there is a high chance of the containment structure collapsing, causing huge amounts of radiation to spread out.
A fireman’s eyes at the Chernobyl disaster are said to have turned from brown to blue because of the intensity of the radiation he received.
There is a type fungi inside the Chernobyl reactors that thrives on radiation.
Flight crews are classified as radiation workers and some are exposed to more radiation annually than nuclear plant workers. One flight from New York to London is equivalent to one chest X-ray.
Smokers receive a radiation dose equivalent to about 300 chest x-rays annually due to the radioactive isotope Polonium-210 contained in tobacco smoke that comes from the ingredients of the fertilizers that are used in farming tobacco.
The USA originally denied that atomic bombs caused lingering radioactivity, calling such claims Japanese propaganda
A handful of raw uranium ore actually only has about as much radiation as 10 bananas. Banana has radiation due to potassium content.
The use of nuclear weapons and testing has resulted in steel contaminated with background radiation in many areas after 1945 making it unusable for many scientific and medical applications and steel made before 1945, often taken from sunken battleships, must be used instead.
On December 27, 2004, Earth was hit by the largest blast of radiation in recorded history. It came from a “giant flare” on a magnetar 50,000 light-years away.

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~ By Amazing Facts 4U Team

Volcano

Amazing Facts 4 U — Sun, 08 Mar 2026 09:30:19 +0000

60 Amazing and Interesting Facts about Volcano | Amazing Facts 4U

Anything that humans cannot control or are afraid of has been associated with gods and divinity. Ancient cultures had their own versions of volcano gods. Ancient Greeks had Hephaistos , the god of craftsmanship and fire. For Romans Vulcan was the blacksmith of gods. Among Hawaiians. Pele is the goddess of volcanoes.
The term “volcano” is from the Latin Volcanus or Vulcan, the Roman god of fire. The Romans first used the term to describe Mt. Etna, a volcanic mountain they believed was the forge of Vulcan.
“Lava” derives from the Latin lavara, meaning “to wash,” and is magma that has erupted at the surface.
Hot liquid rock under the Earth’s surface is known as magma, it is called lava after it comes out of a volcano through some opening. Most volcanoes happen on fault lines, or cracks in the Earth’s surface.
There are four major types of volcanoes, classified according to their shape, composition of their magma, and the way they erupt. Composite Volcanoes (also known as Stratovolcanoes) which are the most common type of volcanoes, generally steep-sided cone shaped mountains most of which have a crater at the summit and erupt with different kinds of lava, ash, and rock . Shield Volcanoes are wide gentle sloping volcanoes that have low viscosity lava flows. Cinder cone volcanoes are smaller single vent volcanoes, that have short-lived eruptions and often have bowl shaped craters at the summit. Lava domes are rounded volcanoes which erupt with very viscous lava that doesn’t flow great distances. An erupting volcano can trigger tsunamis, flash floods, earthquakes, mudflows and rockfalls.
The largest volcano found in the solar system is Olympus Mons on Mars, though it is now extinct. It rises to an elevation of 27 km measuring 550 km across.
Venus may have at one time produced more volcanoes than any other planet in our solar system, though they are all now extinct.
While no other planet besides Earth shows active volcanoes, Io, one of Jupiter’s moons, shows volcanoes that are erupting.
The caldera is the term used for the circular depression formed at the summit of a volcano after a large eruption. Caldera, is Spanish for “kettle.”. Once a big eruption takes place, the volcano collapses in on itself and spews out gases, lava and ash that flow down from the edges of the circular depression or caldera.
The largest caldera is the La Garita Caldera in Colorado which was formed 26-28 million years ago and was one of the largest eruptions if not the largest on Earth.
Our entire world is threatened by what is known as Pacific Ring of Fire. It is actually a volcano string around Pacific Ocean’s perimeter. The Pacific Ring of Fire is responsible for giving some of the world’s deadliest eruptions. This is the area where several tectonic plates move beneath each other.
The Pacific Ring of Firehouses 452 volcanoes that cover 75% of world’s total dormant and active volcanoes above sea level.
The material ejected from a volcano is called “pyroclastic flow” from the Greek pyro (fire) and I (broken) refering to an avalanche of volcanic gases, rock fragments, pumice and hot ash rushing down the slopes of a volcano. It can have amazing speed of 100 kilometers per hour with temperature exceeding 500 degree Celsius.
Volcanoes can dramatically impact global climate as it releases huge amounts ash that gets trapped in atmosphere and prevents sun rays from reaching the earth resulting in a temperature drop. The acid that is released by volcanic eruptions destroys the ozone layer, letting in harmful UV rays of sun to earth. These eruptions also release massive amounts of carbon dioxide leading to greenhouse effect increasing the temperature.
Ash and gases spewed by volcanic eruptions can color sunsets because the material adds more obstacles through which incoming sunlight has to pass before reaching our eyes. The effect accentuates the sky light toward the red end of the spectrum.
About 20% of all volcanoes are under water.
Japan has 10% of the world’s active volcanoes.
Almost 80% of earth’s surface below or above sea level has volcanic origins.
About 350 million or 1 in 20 people live within danger range of an active volcano.
Over last 10,000 years, a total of 1,500 or more volcanoes have erupted. Of these, only about 20-30 erupt in any one year.
World’s oldest and longest document activity is of Sicily’s Mount Etna. It has been active and erupted since 1500 B.C. It is Italy’s most active volcano and also the largest active volcano in Europe.
Indonesia ranks first in terms of number of active volcanoes throughout history. Second position is taken by Japan while U.S. ranks third in the list.
Klyuchevskaya Volcano on Russia’s Kamchatka Peninsula is the largest active volcano in the Northern Hemisphere.
There are no active volcanoes in Australia because it sits in the middle of a tectonic plate.
Volcanoes form through subduction (when two tectonic plates smash against each other), mid-oceanic rift (when two plates drift apart), or in a hot spot (a weak spot in one of Earth’s plates).
In A.D. 79, Vesuvius erupted violently, devastating the towns of Pompeii and Herculaneum killing 16000 people. Eyewitness accounts of the time, recent excavations, and the preserved remains tell the full story of the eruption.
During the past 400 years, nearly a quarter of a million people have been killed as a direct result of volcanic eruptions. Indirect aftereffects such as famine, climate change, and disease most likely have tripled that number.
The eruption of Mount Tambora on Sumbawa island in Indonesia in 1815 is the biggest eruption recorded in history. The explosion for the eruption was heard on Sumatra Island more than 1200 miles away. The destruction was vast, with an estimated ejection volume of 38 cubic miles (160 km3) and a death toll of more than 71,000 people. It created a massive sulfate dust cloud that fundamentally altered the planet’s climate for 3 years.
The 1883 eruption of Krakatau in Indonesia is thought to have released 200 megatons of energy, the equivalent of 15,000 nuclear bombs. Even though the island was uninhabited, the eruption killed 36,000 people as the result of burning ash showers and huge tsunamis. It generated the loudest sound historically reported.
The worst volcanic disaster of the twentieth century is considered to be the eruption of Mt. Pelée in 1902 on the island of Martinique in the Caribbean which killed 30,121 people. Only two people survived: a shoemaker living on the edge of the island and a prisoner who had been locked in a dungeon cell with thick stone walls.
Mount St. Helens is North America’s most active volcano. During the 9 hours that Mount St. Helens erupted in 1980, the volcano spewed about 540 million tons of ash over an area of more than 22,000 square miles causing the largest terrestrial landslide in recorded history, reducing the mountain’s summit by about 1,300 feet . The eruption had 500 times the power of an atomic bomb.
The most dangerous volcano today is Popocatépetl, nicknamed El Popo, which is just 33 miles from Mexico City. El Popo is still active, sending thousands of tons of gas and ash into the air each year.
World’s largest and active supervolcano is Yellowstone Caldera. On top of the Caldera is the Yellowstone National Park. The Yellowstone supervolcano erupted thousands of years ago but till date fuels nearly 10,000 hot springs and geysers which is about 50 % of world’s visible geothermal activity.
In Hawaii you will find two mountains , Mauna Lao and Mauna Kea which are massive volcanoes covering almost entire Hawaii.
Mauna Kea measures 4,205 meters above sea level. However, the height of the mountain when measured from the ocean floor is 10,210 meters making it the highest mountain in this world even larger then Mount Everest.
The most active volcano on Earth is Mount Yasur on Tanna Island, part of the archipelago nation of Vanuatu in the South Pacific. It has been erupting nearly continuously for 111 years.
The Volcano can scream just before exploding. Alaska’s Redoubt Volcano erupted in 2009 but right before erupting, the volcano started screaming forewarning the danger.
The volcanoes can appear all of a sudden from the middle of nowhere. Example is Paricutin, the Mexican volcano in 1943. A long crack in the ground was followed by rumbling noises and rising earth with ash and sulfur coming out. The volcano rose to 165 meters within 24 hours and 230 meters within a week. The lava flow gradually consumed a town named San Juan. It kept erupting for 9 years rising to the height of 424 meters before it eventually died in 1952 covering 10 sq. mile of fertile land.
Paricutin volcano is a monogenetic volcano which is a type of volcano that never erupts again once it dies. So, Paricutin will never erupt again.
The volcano’s called Ol Doinyo Lengai located in Tanzania spews out a type of lava which geologists often call as ‘lava from another planet’. It is 2,200 meters tall and spews out ‘black lava’ which is carbonatite substance similar to dark mud. It is cooler than usual lava and its temperature can reach a maximum of 540℃. When the volcano erupts the lava usually cools while in air and falls down in form of glass shreds.
The black sand beaches in Iceland and Hawaii are formed by grains of black volcanic glass.
Iceland is made up almost entirely of volcanic rocks like those found on the ocean floor. It gradually built up above sea level through intense and prolonged eruptions.
The southernmost active volcano on the planet is Antarctica’s Mount Erebus. It is also home to Earth’s only long lived lava lakes.
Java’s volcano known as Ijen is in the area which has very high volcanic activity resulting in high sulfur concentration. The area is also known to have some of the most lethal acid lakes in the world due to sulfur turning to sulphuric acid.
In the crater of the volcano Ijen is the lake Kawah Ijen, which is the world’s most lethal and largest acidic lake which can eat up metals.
In 1982 scientists came up with what is known as VEI or Volcanic Explosivity Index which is used to determine the power of a volcanic eruption. The VEI runs from 0 to 8.
Eruptions with VEI 0-2 occur weekly or even daily. A category 3 volcanic eruption will shoot out ashes up to 15 kilometers high in sky. These eruptions usually occur once a year. Scale 4-5 are volcanic eruptions that take place once every few decades or centuries. Volcanic ash can shoot up up to 25 kilometers in sky.
Scale 6-7 are called colossal eruptions and super-colossal eruptions respectively which will shoot out lava bombs traveling well over hundred miles or more, cause tsunamis and more!
There is a type of volcanic rock known as pumice. This rock is the only type of rock on Earth that can float on water. Typical pumice will have numerous bubbly holes. These holes are created when the rock cools and hot gases get out of the rock in form of jets.
In 1883 the Krakatoa volcano erupted and was a category 6 explosion. It killed 36,417 people by thermal trauma and tsunamis.
8 on the VEI scale is a mega-colossal explosion at least 100 times more powerful than a category 6 eruption. There hasn’t been any VEI-8 explosion in last 10000 years. VEI-8 can end most of our world.
One of the biggest eruptions ever occurred about 30 million years ago in what is today eastern Nevada and western Utah, when a supervolcano exploded 3500 cubic kilometers of magma over an area of about 12,000 square miles. It left behind deposits of debris 13,000 feet deep. It was a VEI-8 eruption.
Yellowstone National Park in Wyoming sits on the site of an ancient supervoclano of grade VEI-7. It erupted around 2 million years ago, 1.3 million years ago, and 640,000 years ago. If it follows the same pattern, another eruption is due any time now.
Other VEI-7 explosions have taken place so far , one in 74,000 B.C. in Sumatra , Indonesia and one in 24,500 B.C. in Taupo New Zealand.
Volcanologists use a special electric thermometer called a “thermocouple” to take a volcano’s temperature. Lava is so hot that a glass thermometer would melt.
Scientists believe that all the water on the earth was originally vented into the atmosphere by volcanoes.
There is an endangered bird species known as the Maleo which is the only known bird species on earth that uses geothermal energy from the volcanoes to incubate the eggs which are 5 times bigger than chicken eggs. The mama bird seeks out exposed volcanic areas where the eggs can hatch using the geothermal energy from the volcanoes.
Before the Panama Canal opened in 1915, rival proposals for an Atlantic–Pacific link included a plan to carve a canal through Nicaragua, which had a lot more fresh water and much less deadly malaria than Panama but it also had a significant volcanic activity which resulted in Panama getting the vote.
Cerro Negro, a new and very active volcano that first erupted in 1850 and has blown 23 times since, most recently in 1999 has black pebble covered slopes you can surf down on a metal-bottomed wood board.
Surtsey, one of Earth’s newest islands, was dramatically formed in 1963 by underwater volcanic eruptions. Surtsey Island, which lies off the southwest coast of Iceland.

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~ By Amazing Facts 4U Team

Drowning

Amazing Facts 4 U — Fri, 06 Mar 2026 09:30:46 +0000

30 Amazing and Interesting Facts about Drowning | Amazing Facts 4U

About 1 million people around the world die by drowning every year, that is more than two persons per minute. Among them 50 % are children.
There are about 8 to 10 times that many who experience a drowning process but who reach safety alone or are rescued by others.
Every day about 10 people die due to drowning in the US. Nearly 80% of people who die from drowning are male.
Cardiopulmonary Resuscitation (CPR) performed by bystanders has been shown to save lives and improve outcomes in drowning victims. The more quickly CPR is started, the better the chance of improved outcomes. CPR should be learned by everybody.
If you are caught in a rip current, swim parallel to shore. Once free of the current, swim diagonally toward shore.
One does not need an enormous depth of water to drown. Drowning can actually happen in as little as 12 inches (30 mm) of water.
Children can drown in toilets, buckets, baths, etc. An adult will usually not drown in a bucket or a toilet unless they are under the influence of alcohol or drugs.
Besides water people can drown in other liquids also especially in industrial establishments.
“Wet drowning” is a type of drowning in which the water manages to enter the lungs. In fact, the air tube is sealed the moment water enters airways preventing water from entering lungs. This is due to vocal cord and larynx constrictions. As air tube is blocked, even air cannot enter lungs making person unconscious. Once unconscious, the air tube opens and water rushes into the lungs causing death.
In “dry drowning” the air tube will stay shut and cause cardiac arrest and hence, death. In this case the person will die before water enters lungs. Amazingly once the person is dead, water fails to enter lungs.
In “secondary drowning”, a person actually inhales a small amount of liquid or water into lungs which irritate lungs, impairs gas exchange leading to pulmonary edema and eventually causes death by respiratory failure. This can happen even due to poison gases or chemical and even vomit getting inhaled!
Deepwater blackout is yet another type of drowning. When someone dives into water, the oxygen present in lungs is capable of producing enough pressure to keep the person conscious. But this pressure starts falling as the person ascends from the depths of water and causes latent hypoxia causing deep water blackout when the person reaches surface. The moment the person loses consciousness, he or she sinks! This is usually not a common occurrence and happens rarely usually to strong and fit swimmers.
We also have shallow water blackout. Just before diving or swimming, a person feels a strong urge to breathe, especially exhale. As a person exhales, CO2 level falls. Once in water, a person will not feel the strong urge to breathe in or inhale because the CO2 level is low but he or she will not realize that the brain is deprived of oxygen. He or she continues to swim only to faint all of a sudden and then sink. Most cases of shallow water blackout occur in swimming pools or shallow water bodies.
Drowning in saltwater usually takes longer. When a drowning person inhales salt water, the salt concentration in the lungs increases. Water from blood rushes into the lungs to dilute the saltwater. As a result, the blood thickens. When the blood thickens, the heart comes under pressure and causes cardiac arrest. This takes about 8-10 minutes.
Since the cardiac arrest in seawater drowning happens after 8-10 minutes, it is easier to rescue people drowning in saltwater.
In contrast to saltwater, drowning in freshwater gives you little time to rescue. If freshwater is inhaled, the water becomes hypotonic compared to tissues in the lungs. So, the water rushes into the cells to dilute the cells’ salt concentration. The red blood cells then burst, releasing hemoglobin which gets accumulated in kidneys, leading to acute renal failure. Freshwater is also absorbed into blood thereby diluting it and cooling the heart sufficient enough to cause hypothermia-induced cardiac arrest. This happens in just 2-3 minutes. Thus, rescuers do not get enough time to save the victims.
In fact, 90% of the drowning cases occur in freshwater.
It is a myth that a drowning person shouts and yells and calls for help. In fact, our respiratory system is designed to first breathe and then generate speech. When a person drowns, his or her mouth usually sinks below the water surface and then resurfaces in very short successions. This gives the respiratory system just enough time to concentrate on its primary function, i.e. breathing. A person tries to quickly inhale and exhale. Yelling becomes literally impossible.
It is also a myth that a drowning person throws out arms and legs in all possible directions. In fact, out of instinct, a drowning person will extend his or her arms laterally trying to press down on water surface and keep their mouth out of water to continue breathing. This arm movement is completely involuntary and happens on its own. So waving or throwing arms at get the attention of rescuers is literally impossible.
In case of true drowning, people really cannot help themselves even by reaching out for a rope or a ring thrown at them. Drowning is a very silent process contrary to what we see in movies.
A drowning person will usually show a few signs which most of us fail to recognize. Usually the head of the person will be low in water with mouth at the level of water and occasionally sinking in and coming out of water. Eyes will become empty and glassy and will usually lose focus. Eyes will mostly be open and the face will reflect fear. He or she will usually be gasping with hands stretched laterally. It will appear as if he or she is trying to climb up a ladder that is invisible. Legs and arms will be mostly under water.
Children are more susceptible to drowning. They can drown even in presence of adults right next to them! So, it is important to keep an eye on them always and look for any signs of drowning.
You have to be vigilant. A person next to you in water may be drowning and drown silently. Take special care when children are in water.
At home it is a good precaution to empty all tubs, buckets, containers and wading pools immediately after use. Store them upside down and out of children’s reach.
Keep toilet lids closed and use toilet seat locks to prevent drowning. It’s also a good idea to keep doors to bathrooms and laundry rooms closed.
We’re relatively poor swimmers when compared to other animals but we have the mammalian diving reflex. When a human’s face touches water, the airway closes, the heart rate slows, and the capillaries in the skin and extremities constrict, sending blood toward the vital organs. This serves a dual purpose of keeping the organs oxygenated and insulated from increasing water pressure. It also saps strength from the limbs for swimming. This reflex is most frequently seen in drowning children giving them a better chance of recovery than adults.
Due to above reflex action, the bodies of children who have been submerged for many minutes have been resuscitated with no neurological damage.
At a 1985 bash in New Orleans, Louisiana, party was being held to celebrate a summer where no one had drowned at any of the city’s pools. There were some 200 people in attendance, over half of which were certified, lifeguards. A further four lifeguards were also on active duty. Yet a 31-year-old Jerome Moody died in pool and nobody noticed.
The Dead Sea located between Israel and Jordan has so much salty water that it is too dense for a person to drown.
In fact, most sharks actually need to continue swimming to be able to survive. If they don’t swim all the time, then they will end up drowning.

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~ By Amazing Facts 4U Team

Television

Amazing Facts 4 U — Thu, 26 Feb 2026 09:30:35 +0000

40 Amazing and Interesting Facts about Television | Amazing Facts 4U

Television sets receive and display broadcasts of moving images and also produce sound through speakers.
The images on a TV screen in fact refresh fast enough to appear as a smooth motion to the human eye.
In fact, the first black and white static transmission was created by the German inventor Paul Nipkow’s way back in 1884.
John Logie Baird made technological history when the first transmission of a moving human face was seen on television on 30th October 1925.
The world’s first working television system was electromechanical.
The human face that was first aired on Baird’s TV screen was his office boy, William Taynton, who the inventor paid two shillings and a sixpence per week to simply sit in front of the hot TV transmitter.
The first television set had only 30 lines of display giving a very coarse image. Currently, the digital signal of the television sends pictures with 1080 lines.
Amazingly the inventor of the television would not let his own children watch TV. He once said to his son “There’s nothing on it worthwhile”.
The First American television station started working in 1928, and BBC transmission began in 1930.
The word “television” entered the English language in 1907 coined by the Russian scientist, Constantin Persky. The abbreviation “TV” was first used in 1948.
Cable television made its debut in Canada in 1952.
Worldwide 100 million television sets were sold first time in 1960.
The first satellite TV transmission took place between France and the US in 1962.
Color television sets didn’t become widespread until the 1970s. Sales of color TVs surpassed black-and-white sets for the first time in 1972.
The first TV remote control was created in 1950 by Zenith and was connected to a television by a wire. The 1980s saw the arrival of remote controls.
Early monitors used cathode ray tubes (CRT) which have since been replaced by thinner screens that use liquid crystal display (LCD) and plasma.
Similar to radio, television broadcasts are transmitted at specific frequencies.
More recently there has been a change from analog transmissions to digital. The 0’s and 1’s of a digital transmission are like the information stored in a computer, making them more reliable than traditional analog broadcasts.
Television became widely popular after the end of World War II. Over 1 million American homes had a television in 1948.
The first television commercial for Bulova watches was broadcast on July 1, 1941, in New York before a baseball game between Philadelphia and Brooklyn. It showed a watch ticking for exactly 60 seconds. The company paid only $9 for the ad. Currently, prime time TV advertising cost millions.
The first car commercial on television was for Chevrolet and aired on June 9, 1946.
The average American family watches TV for eight hours per day.
Currently, there are about 300 million television sets in the United State.
Way back in 1950, only 10 percent of U.S. households had a television. The percentage increased to an unbelievable 90% in 1960. Now 99% of American homes own at least one television set, and 66% have at least three.
In the US the first colored pictures were aired for the 1954 Tournament of the Roses Parade; however, most programs were black and white until 1955. The UK aired the first color pictures on BBC2 during Wimbledon in 1967. in color.
Most people dream in color, but those that grew up watching black and white television may often dream in black and white.
The Video Cassette Recorder (VCR) was launched for consumers in 1963 in the UK, allowing viewers to record their favorite TV shows for the very first time. The videos could record only up to 20 minutes of TV. It took another decade for the technology to become a global success.
After President Kennedy’s death in 1963, the television networks aired four days of commercial-free coverage of his funeral, burial, and other proceedings, costing them about $100 million in lost advertising revenue. About 93% of American homes watched some coverage.
Product placement is illegal on Norwegian television.
The television is on for an average of about 8 hours a day in U.S. homes.
It has been calculated that the average American child sees about 13,000 deaths on television between the ages of five and 14.
The average American child sees about 200,000 acts of violence on TV by the age of eighteen.
Liquid Crystals were in fact accidentally discovered by Friedrich Reinitzer in 1888. However, it remained a scientific curiosity for about 76 years before they were used to build liquid crystal displays (LCD) in 1964.
NASA has announced that they have lost all of their original tapes of Apollo 11’s TV transmission in August 2006.
The world’s largest LED display, the Fremont Street Experience, in Las Vegas is over 1,500 ft. long and 90 ft. high at the peak built-in 1995.
The first public digital high-definition television (HDTV or HD) broadcast was made in the United States in 1996.
Television viewers in the UK have to pay $225 for a “television license” every year as a tax to support the BBC.
During a live news broadcast in 1974, the news anchor announced “In keeping with Channel 40’s policy of bringing you the latest in blood and guts, and in living color, you are going to see another first—attempted suicide.” then shot and killed herself live on television.
Amazingly until 1987, there were no television broadcasts in Iceland on Thursdays.
The famous revolving globe that is utilized by the NBC news series spent many years turning in the wrong direction. In 1984 this was eventually found and now the globe is turning correctly.

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