Balsa wood is classified as a hard wood!
41
Most dust particles in your house come from dead skin.
48
Out of all the senses, smell is most closely linked to memory.
146
The average temperature at 40,000 feet above sea level is -60 F.
56
Nearly 50% of the world's scientists are assigned to military projects.
71
Aluminum used to be more valuable than gold!
84
One cubic foot of gold weighs more than 1,200 pounds!
78