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 has been scientifically proven that stroking a cat can lower one's blood pressure!
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Enamel is hardest substance in the human body.
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We share 70% of our DNA with a slug.
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Babies crawl an average of 200m a day.
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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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The human brain is more active during sleep than during the day.
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