A cubic yard of air weighs about 2 pounds at sea level.
31
A ball of glass will bounce higher than a ball made of rubber.
73
The average home creates more pollution than does the average car.
33
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
One cubic foot of gold weighs more than 1,200 pounds!
78
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Balsa wood is classified as a hard wood!
41