Why Do Stars Shine Only at Night?
Why Do Stars Shine Only at Night? Though stars seem to disappear when daylight comes, there are really stars in the sky all day, and their light keeps streaming to...
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What Makes Thunder?
What Makes Thunder? A bolt of lightning is a big electric spark. During a thunderstorm, electrical charges are built up in the clouds. When the charge becomes strong...
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Why Does the Camel Have a Hump?
Why Does the Camel Have a Hump? The camel’s best known feature is the hump on its back. The camel’s hump is mostly fat that provides nourishment when food...
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Why Do Fish Swim in Schools or Shoals?
Why Do Fish Swim in Schools or Shoals? Some fish swim alone; others stay in groups known as “schools” or “shoals”. A school of fish swims in formation, moving and...
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How Do Jet Engines Work?
How Do Jet Engines Work? You can make a simple jet engine by filling a balloon with air and letting it go. Jet engines work on the principle that every action has an...
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