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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Optical illusions occur when what the eyes see conflicts with what the brain expects.
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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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Scientists are attempting to create a synthetic brain by reverse-engineering the mammalian brain down to the molecular level. A cellular human brain is predicted possible by 2023. It hopes to shed light on consciousness.
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A cubic yard of air weighs about 2 pounds at sea level.
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Scientists in Germany have developed a candy that doesn't cause cavities.
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The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
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