Why Do Leaves Turn Colors in the Fall?
Why Do Leaves Turn Colors in the Fall? The green we see in leaves all summer comes from the green pigment “chlorophyll,” which leaves use in making food. Other colors...
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Why Does a Gorilla Beat Its Chest?
Why Does a Gorilla Beat Its Chest? A male gorilla beats his chest as a means of emphasizing his authority over the rest of the troop, or to frighten away intruders....
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How Do Hearing Aids Work?
How Do Hearing Aids Work? Hearing aids change sounds into electrical signals that could then be amplified and converted back into sounds that could be transmitted into...
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How Does an Elevator Work?
How Does an Elevator Work? Modern elevators hang from strong steel cables and work just like a pulley. Powerful electric motors at the top of the elevator shaft turn a...
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Is It Natural to Swing Your Arms When Walking?
Is It Natural to Swing Your Arms When Walking? For a long time, scientists thought that swinging your arms while walking served no purpose. Their best guess was that it...
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Why Did People Wear Curly Wigs in the 1700s?
Why Did People Wear Curly Wigs in the 1700s? For the wealthier people in the 1600s and 1700s, wigs were the only thing to wear. The fashion started in France, when...
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How Will You Explain Coffee-ground Emesis?
How Will You Explain Coffee-ground Emesis? Coffee-ground emesis is the term used for when someone has episodes of vomiting that resembles used coffee grounds. Coffee...
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Why Is the Wedding Ring Worn on the Third Finger of the Left Hand?
Why Is the Wedding Ring Worn on the Third Finger of the Left Hand? There is a reason for the wedding ring being worn on the third finger of the left hand. The ancient...
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How Are Olives Pickled?
How Are Olives Pickled? An unusual thing about the olive is that it cannot be eaten fresh from the tree. Fresh olives have a bitter taste that must be removed by...
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How Do Sea Stars Eat?
How Do Sea Stars Eat? In recent years, starfish have been more correctly renamed “sea stars,” because they are not fish. They are echinoderms and related to sand...
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