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Why aren't there freshwater seals or dolphins in the Great Lakes?

Why Aren't Dolphins in the Great Lakes? And More Questions From Our Readers

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Could we use volcanic energy as a power source?

Could Volcanoes Power Our Planet? And More Questions From Our Readers

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I thought I saw more red foliage this fall. Is that related to climate change?

Does Climate Change Affect Leaves' Fall Colors? And More Questions From Our Readers

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Why can't machines process CO2 the way trees do?

Why Can't Machines Process CO2 Like Trees? And More Questions From Our Readers

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Can every living thing be traced to a single cell?

Can Every Living Thing Be Traced to a Single Cell? And More Questions From Our Readers

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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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