Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
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The human brain is more active during sleep than during the day.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
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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.
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