All facts — Page 34
The complete ONAURE library, newest first. Every fact has an explanation and a source you can check.
1196 facts
The human heart pumps about 7,500 litres of blood per day.
At rest, the heart beats between 60 and 100 times per minute and pushes about 70 millilitres of blood with each beat…
Vanilla is the only widely used spice that comes from an orchid.
Vanilla is extracted from the pods of a climbing orchid of the genus Vanilla, native to Mexico. Natural pollination…
Decaffeinated coffee can still contain a small amount of caffeine.
The decaffeination process removes most of the caffeine, but not all. United States regulations require decaffeinated…
The first plant grown and eaten in space was lettuce.
In 2015, astronauts on the International Space Station grew romaine lettuce in a hydroponic system and ate it in…
La Rinconada, in Peru, is the highest permanent settlement in the world.
La Rinconada is at an altitude of about 5,100 metres, in the Peruvian Andes, near a gold mine. About 50,000 people…
In ancient Egypt, workers were paid with bread and beer.
Egyptians received rations of bread and beer as payment for work, including those who built the pyramids. Beer was a…
The shortest war in history lasted about 38 minutes.
The Anglo-Zanzibar War of 1896 began when the Sultan of Zanzibar refused to abdicate and lasted about 38 minutes. The…
The Vikings did not wear horned helmets.
The image of Vikings with horned helmets is a 19th-century invention, popularised in operas and romantic…
Antarctica is a desert, despite being covered in ice.
A desert is defined by the amount of precipitation, not by temperature. Antarctica receives less than 50 millimetres…
Lotus leaves repel water and always stay clean.
The surface of lotus leaves has a microscopic structure that makes water form droplets and slide off, taking dirt…
There are bacteria that breathe iron instead of oxygen.
Some bacteria use iron instead of oxygen to produce energy. These microorganisms live in oxygen-free environments…
Atoms are almost entirely empty space.
If the nucleus of an atom were the size of a tennis ball, the electrons would be several kilometres away. Matter…
A solar day on Mercury lasts about 176 Earth days.
Mercury rotates very slowly on its axis and, at the same time, moves quickly around the Sun. As a result, a solar day…
The International Space Station completes one full orbit around Earth in about 90 minutes.
The ISS orbits Earth at an altitude of about 400 kilometres and at a speed of approximately 28,000 kilometres per…
There are planets that orbit two stars at the same time.
NASA s Kepler telescope confirmed the existence of planets that orbit two suns, such as Kepler-16b. These worlds…
The first email was sent in 1971 and used the at sign to separate the user name from the machine.
Ray Tomlinson, an ARPANET engineer, sent the first email in 1971. He chose the at sign because it was not used in…
The world's first website is still online.
The first website was created by Tim Berners-Lee at CERN in 1991 to explain what the World Wide Web was. The page can…
The vulture's stomach produces an acid so strong that it can digest bones.
The pH of a vulture's stomach reaches values close to zero, more acidic than a car battery. This environment destroys…
The tongue print is unique to each person, just like a fingerprint.
Like fingerprints, the pattern of papillae and grooves on the tongue is unique to each individual. No other person…
The discovery of coffee is attributed to a goat herder in Ethiopia.
According to legend, an Ethiopian herder named Kaldi noticed that his goats became agitated after eating red berries…
Angel Falls in Venezuela is the world's highest waterfall.
Angel Falls, in Venezuela, has a total height of 979 metres, of which 807 metres are an uninterrupted drop. It is the…
The Dead Sea is the lowest point of dry land on the planet.
The Dead Sea is located about 430 metres below sea level, on the border between Israel and Jordan. It is also one of…
During the First World War, enemy soldiers exchanged gifts and played football on Christmas 1914.
In December 1914, along the Western Front, British and German soldiers left their trenches, exchanged cigarettes and…
An average cumulus cloud weighs about 500 tonnes.
A typical cumulus cloud contains about 500 tonnes of water in the form of droplets. The weight does not fall on us…
