Sound travels about 4 times faster in water than in air.
408
Each day, up to 150 species of life become extinct.
-23
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Nuclear power prevented an average of over 1.8 million deaths between 1971-2009 as a result of lower air pollution from reduced coal usage according to NASA.
5
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39