There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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Brass doorknobs automatically disinfect themselves in about 8 hours.
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Leonardo da Vinci could write with one hand and draw with the other at the same time.
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All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
21
As part of an advertising campaign, Molson, a Canadian beer company, strategically placed 'beer fridges' around Europe that only Canadian passports could unlock.
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