Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Most dust particles in your house come from dead skin.
48
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Cold water weighs more than hot water.
93
Research indicates that plants grow healthier when they are stroked.
173
Iron weighs more after it rusts.
16
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15