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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There are about 255 babies born worldwide every minute.
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When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
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A person will create enough saliva to fill two average size swimming pools during his lifetime.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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Our brains have a negativity bias and will remember bad memories more than good ones.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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The human brain has the capacity to store everything that you experience.
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