A ball of glass will bounce higher than a ball made of rubber.
73
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Aluminum used to be more valuable than gold!
84
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
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
One cubic foot of gold weighs more than 1,200 pounds!
78