Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Sound travels about 4 times faster in water than in air.
408
Aluminum used to be more valuable than gold!
84
Each day, up to 150 species of life become extinct.
-23
Nylon is made from coal and petroleum.
42
One ragweed plant can release as many as one billion grains of pollen!
51
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
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