Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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It takes approximately 12 hours for food to entirely digest.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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If your DNA was stretched out it would reach to the moon 6,000 times.
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An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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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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