One cubic foot of gold weighs more than 1,200 pounds!
78
A ball of glass will bounce higher than a ball made of rubber.
73
A cesium atom in an atomic clock beats over nine billion times a second.
43
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Cold water weighs more than hot water.
93
A cubic yard of air weighs about 2 pounds at sea level.
31
In zero gravity, a candle's flame is round and blue.
16
Sound at the right vibration can bore holes through a solid object.
134