Iron weighs more after it rusts.
16
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
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
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
Nylon is made from coal and petroleum.
42
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155