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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It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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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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Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
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