When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
One barrel of petroleum holds 42 gallons.
20
Balsa wood is classified as a hard wood!
41
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17