One ragweed plant can release as many as one billion grains of pollen!
51
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
The average temperature at 40,000 feet above sea level is -60 F.
56
One barrel of petroleum holds 42 gallons.
20
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
According to scientists, the color of the cup that we're drinking from can alter our perception of the actual taste of the drink.
12
No matter how cold it gets, gasoline will not freeze.
107