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Skin makes up 16 percent of a person's body weight and is the largest organ of the human body; skin allows birds to fly, enables mammals to nurse their young, and provides a lifelong defense against predators and parasites.
During the history of life on Earth, sex may rank as the ultimate survival skill because the bottom line for any species is reproduce or die; intercourse among everything from dinosaurs to insects, dinosaurs, pandas and people.
The first vertebrate flyer, the pterosaur, first took to the air 220 million years ago and eventually evolved to the size of a small airplane; comparing the fossil record to living birds.
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