A US ton is equivalent to 900 kg (2000 pounds). A British ton is 1008 kg (2240 pounds), called a gross ton.
Hydrogen gas is the least dense substance in the world.
The double-helix structure of DNA was discovered in 1953 by James Watson and Francis Crick. The length of a single human DNA molecule, when extended, is 1.7 metres (5 ft 5 in).
A square piece of dry paper cannot be folded in half more than 7 times.
Since space is essentially empty it cannot carry sound. Therefor there is no sound in space, at least not the sort of sound that we are used to.
The crawler, the machine that takes the Space Shuttle to the launching pad moves at 3km/h (2 mph).
Luke Howard used Latin words to categorize clouds in 1803.
Earth is slowing down – in a few million years there won’t be a leap year.
A storm officially becomes a hurricane when cyclone winds reach 119 km/h (74 mph).
Earth is not round; it is slightly pear-shaped. The North Pole radius is 44mm longer than the South Pole radius.
The ozone layer averages about 3 millimeters (1/8 inch) thick.
The sun is 330,330 times larger than the earth.
The deepest point in the sea: the Mariana Trench off Guam in the Pacific Ocean; it is 10,9 km (6.77 miles) below sea level.
The tallest waterfalls in the world are Angel Falls in Venezuela. At 979 m (3,212 ft), they are 19 times taller than the Niagara Falls, or 3 times taller than the Empire State Building.
The order of the planets, starting closest to the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
If the amount of water in your body is reduced by just 1%, you’ll feel thirsty.
The muscle that lets your eye blink is the fastest muscle in your body. It allows you to blink 5 times a second. On average, you blink 15 000 times a day. Women blink twice as much as men.
The length from your wrist to your elbow is the same as the length of your foot.
On average a hiccup lasts 5 minutes.
If all your DNA is stretched out, it would reach to the moon 6,000 times.
The first fax process was patented in 1843.
The first electronic mail, or “email”, was sent in 1972 by Ray Tomlinson. It was also his idea to use the @ sign to separate the name of the user from the name of the computer.
Charles Macintosh invented the waterproof coat, the Mackintosh, in 1823.
Thomas Edison filed 1,093 patents, including those for the light bulb, electric railways and the movie camera. When he died in 1931, he held 34 patents for the telephone, 141 for batteries, 150 for the telegraph and 389 patents for electric light and power.
The first neon sign was made in 1923 for a Packard dealership.
Air becomes liquid at about minus 190 degrees Celsius.
Water expands by about 9% as it freezes.
The typical bolt of lightning heats the atmosphere to 50,000 degrees Fahrenheit.
Sound travels through water 3 times faster than through air.
The word “biology” was coined in 1805 by Jean-Baptiste Lamarck.