A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
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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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Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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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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If your DNA was stretched out it would reach to the moon 6,000 times.
256
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
The average sperm cell swims at 8 inches per hour.
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