Contrary to popular belief, plastic cutting boards are more likely to harbor bacteria than wood ones. New plastic boards are easier to clean, but ones with cuts are nearly impossible to completely disinfect, whereas wood ones absorb and kill bacteria, regardless of age or use.
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Parrot parents "name" their children with a signature call.
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Service dogs are trained to know when they are on duty. When their harness is on, they know they are at work. When you take it off they instantly become playful and energetic.
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In zero gravity, a candle's flame is round and blue.
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The first female self-made millionaire in America was a black woman.
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If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Iron weighs more after it rusts.
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Not swinging your arms when you walk increases the effort of walking by 12%, the equivalent of walking 20% faster or carrying a 10 kg backpack.
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