Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Sound travels fifteen times faster through steel than through air.
134
Indoor pollution is 10 times more toxic than outdoor pollution.
62
A cubic yard of air weighs about 2 pounds at sea level.
31
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
According to studies, men change their minds two to three times more often than women.
72
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44