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Why is it still so hard to make nuclear weapons?Scientists have been building nuclear weapons for more than 80 years, but crafting this technology remains a challenge.
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What if a giant asteroid had not wiped out the dinosaurs?Nonavian dinosaurs have been extinct for 66 million years, but what would have happened if they'd survived?
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Do atoms ever touch?Atoms make up everything around us, but do these building blocks of matter ever actually touch?
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Can gray hair be reversed?Gray hair is often a sign of aging, but is it possible to delay its advance or reverse the color change?
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How did the Concorde fly so fast?The Concorde was the fastest commercial plane ever flown, but its speed came with a hefty price tag.
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How far away is the moon?The moon's distance from Earth changes depending on where it is in its elliptical orbit.
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Why does metal squeak?Squeaking metal can be grating on the nerves, but it serves an important purpose.
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Will we ever reach Alpha Centauri, our closest neighboring star system?Visiting our nearest stellar neighbor will take near-light-speed travel.
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Why does cotton shrink?The science of ruining your favorite shirt is more complicated than you might think.
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Have days on Earth always been 24 hours?Earth's day used to be five hours shorter, and it's predicted to continue lengthening over time.
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What could aliens look like?The search for alien life is one of humanity's greatest missions, but it may look nothing like anything we've seen on Earth.
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Can mirrors facing each other create infinite reflections?Infinite mirrors are a fun party trick, but the physics behind this phenomenon explains why it may not be true.
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The Decade in Astronomy: These Space Discoveries Shaped the 2010sAs the 2010s come to a close, it's time to revisit how some of the biggest space science stories shaped the decade.
