Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
The largest cell in the human body is the female egg and the smallest is the male sperm.
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A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
A person can live without food for about a month, but only about a week without water.
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There are about 255 babies born worldwide every minute.
46
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
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