A cubic yard of air weighs about 2 pounds at sea level.
31
Out of all the senses, smell is most closely linked to memory.
146
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
One barrel of petroleum holds 42 gallons.
20
Nearly 50% of the world's scientists are assigned to military projects.
71
Iron weighs more after it rusts.
16
The bark of an older redwood tree is fireproof.
65
Most dust particles in your house are made from dead skin!
67