Sound travels about 4 times faster in water than in air.
408
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
0
A cubic yard of air weighs about 2 pounds at sea level.
31
Cold water weighs more than hot water.
93
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
One barrel of petroleum holds 42 gallons.
20
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13