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Outside of Earth, is there any place a human could survive unprotected for even ten seconds?  

Could Humans Survive Unprotected Outside of Earth's Atmosphere for Even Ten Seconds?

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Why do chickens have wings if they can’t use them to fly?

Why Are Chickens So Bad at Flying? And More Questions From Our Readers

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Did lions once live in ancient Greece?

Did Lions Live in Ancient Greece? And More Questions From Our Readers

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Have any modern animals adapted to human activity through natural selection?   

Have Any Animals Evolved to Adapt to Human Activity?

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How much advance warning would we have if a large comet were headed on a collision course with Earth?

How Much Warning Would We Have of an Earth-Shattering Comet? And More Questions From Our Readers

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After the American Revolution, why did the colonies keep their British nobility namesakes?

Why Did the American Colonies Keep Their British Names After the Revolution?

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One reader wonders: Have any Native American nations been governed by women? 

Have Women Ever Run a Native American Nation? And More Questions From Our Readers

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One reader wonders: Why did ants make it all over the Americas while anteaters didn’t?  

Why Do Anteaters Live Only in the Tropics and More Questions From Our Readers

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One reader wonders: Why do we see the Moon during the day and not the Sun at night?

Why Can We See the Moon During the Day? And More Questions From Our Readers

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One reader wonders: Since purple dye was scarce, why didn’t people just combine blue and red?

Why Was Purple the Color of Royalty? And More Questions From Our Readers

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One reader wonders why men’s bicycles have crossbars but not women’s.  

Why Do Only Men's Bicycles Have Crossbars? And More Questions From Our Readers

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One reader wonders how birds stay balanced on tree branches while they’re asleep.   

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How Do Birds Stay Upright When They Are Sleeping?

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One reader wonders if European modernists thought of the American painter Georgia O’Keeffe as a remarkable artist.  

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Was Georgia O'Keeffe's Genius Appreciated Outside of America? And More Questions From Our Readers

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One reader wonders what graffiti was like before spray paint.

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What Did Graffiti Look Like Before Spray Paint and More Questions From Our Readers

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One reader wonders why more flowers and fruits aren't blue-hued.

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Why Are So Few Flowers and Fruits Blue? And More Questions From Our Readers

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All mollusks build their own shells.

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How Do Snails Get Their Shells? And More Questions From Our Readers

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Cardiovascular disease is the leading cause of death for captive apes.

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How Do Gorillas Get Heart Disease? And More Questions From Our Readers

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Both beer and wine are thought to predate distilled spirits.

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'Which Came First: Beer or Wine?' and More Questions From Our Readers

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James Smithson was the Smithsonian’s founding donor, bequeathing approximately one ton of gold British sovereigns.

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Why Did James Smithson Leave His Fortune to the U.S. and More Questions From Our Readers

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NASA's Ingenuity helicopter arrived on Mars on February 18, 2021.

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Why Did NASA Test a Helicopter on Mars?

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