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 Some Elephants Have Very Large Ears?
Why Do Some Elephants Have Very Large Ears? African elephants have larger ears than Indian, or Asiatic, elephants because they live in hotter conditions and are bigger...
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What Causes Whirlwinds?
What Causes Whirlwinds? Whirlwinds are caused by the rising of an overheated layer of air close to the ground. Whirlwinds occur when the sun heats the air near the...
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Why Do Some Flowers Close up at Night?
Why Do Some Flowers Close up at Night? Flowers close their petals at night because they are protecting the pollen and other reproductive parts of the plant that are...
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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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