Iron weighs more after it rusts.
16
Sound travels about 4 times faster in water than in air.
408
Nylon is made from coal and petroleum.
42
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Research indicates that plants grow healthier when they are stroked.
173
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The left ear is more responsive to words of love and emotion whispered into it than the right.
40
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