The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Out of all the senses, smell is most closely linked to memory.
146
Iron weighs more after it rusts.
68
A cubic yard of air weighs about 2 pounds at sea level.
31
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
If the chemical sodium is dropped into water it will immediately and violently explode.
67
The left ear is more responsive to words of love and emotion whispered into it than the right.
40
Scientists are attempting to create a synthetic brain by reverse-engineering the mammalian brain down to the molecular level. A cellular human brain is predicted possible by 2023. It hopes to shed light on consciousness.
10