Out of all the senses, smell is most closely linked to memory.
146
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Iron weighs more after it rusts.
16
Aluminum used to be more valuable than gold!
84
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
One barrel of petroleum holds 42 gallons.
20