One gallon of used motor oil can ruin approximately one million gallons of fresh water!
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Cold water weighs more than hot water.
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If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
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During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
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4.5 pounds of sunlight strike the Earth each day.
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Most dust particles in your house come from dead skin.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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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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