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Photography was so expensive when it was first introduced that people treated getting their photo taken like a once-in-a-lifetime portrait opportunity.

Why Don't People Smile in Old Photographs? And More Questions From Our Readers

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A volcano can provide a great deal of geothermal energy

Could Yellowstone's Volcanoes Provide Geothermal Power and More Questions From Our Readers

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One of this issue's questions is about the starfish's namesake shape.

Why Are Starfish Shaped Like Stars and More Questions From Our Readers

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If Light Can't Escape Black Holes, How Do We Get Photos of Them... and More Questions From Our Readers

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Does the Same Goose Always Lead the Flying V and More Questions From Our Readers

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Could Lava Incinerate Trash and More Questions From Our Readers

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Do Marine Mammals Yawn and More Questions From Our Readers

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How Come U.S. Currency Never Changes Its Face and More Questions From Our Readers

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What's the Difference Between Moths and Butterflies and More Questions From Our Readers

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Why Don't We See Fireflies in the Western U.S.?

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The handbones seen in the whale model in the center of this image tell the curious story of how whales went from land to water.

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What’s a "Missing Link"?

While some still use the term, experts abhor it because it implies that life is a linear hierarchy

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Who Was the First First Lady to Adopt a Cause and More Questions From Our Readers

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Many animals, like this red sphinx cat, are bred to be hairless. Other times, animal baldness is a symptom of stress and other factors.

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Do Other Animals Besides Humans Go Bald?

From Andean bears to Rhesus macaques, non-human mammals have hair woes of their own

A replica of Foucault's famous experiment at the Museo Nazionale della Scienza e Tecnica in Milan, Italy

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How Does Foucault's Pendulum Prove the Earth Rotates?

This elegant scientific demonstration has been delighting everyday people for nearly 200 years

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Can All Living Things Exhibit Albinism?

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What's a dinosaur, anyways? The answer is in the evolutionary tree.

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What Makes a Dinosaur a Dinosaur?

The question may sound like a "duh," but it gets to the heart of how we categorize and define nature

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Do Other Animals Cry and More Questions From Our Readers

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Why Do So Many Train Stations Have the Same Name?

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When Did East Asian Countries Adopt the Western Calendar and More Questions From Our Readers

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How Many Ways Can Snake Venom Kill You and More Questions From Our Readers

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