Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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You can't tickle yourself.
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Our Right Lungs takes more air than our left lung.
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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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The human brain has the capacity to store everything that you experience.
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The largest cell in the human body is the female egg and the smallest is the male sperm.
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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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We share 70% of our DNA with a slug.
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