When Was the Thermometer Invented?
When Was the Thermometer Invented? The first practical thermometer or instrument for measuring temperature was invented shortly before the end of the 16th Century by...
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Why Do Your Eyes Water When You Slice Onions?
Why Do Your Eyes Water When You Slice Onions? Onions contain strong-smelling oil. When the onion is peeled and cut, this oil escapes into the air in the form of vapor...
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Why Are Stars Different Colors?
Why Are Stars Different Colors? Stars are many different colors because some of them are hotter than others. Stars are either red, orange, yellow, white or...
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Where Do Puddles Go When They Dry Up?
Where Do Puddles Go When They Dry Up? When we say that a puddle has dried up, we mean that the water in it has evaporated. When water is exposed to air, some of it...
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What Is Scuba Diving?
Scuba diving is a mode of underwater diving in which a scuba diver uses a self-contained underwater breathing apparatus (scuba) to breathe underwater. Unlike other...
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