Every few years, a headline or social-media post seems to announce the same piece of cosmic good news: Pluto is a planet again. For anyone who learned the old nine-planet Solar System in school, the idea has obvious emotional appeal. Unfort...
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A newly hatched chick enters the world with an urgent problem. It can walk almost immediately, but walking in the wrong direction could be fatal. In nature, staying near a parent means warmt...
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In 1997, IBM's Deep Blue defeated world chess champion Garry Kasparov in a match. The achievement looked like a milestone on the road to machine intelligence: a computer had conquered a game...
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Few animals have contributed to modern medicine in a way quite as improbable as the horseshoe crab. It looks prehistoric because, in evolutionary terms, it is. Horseshoe-crab relatives were...
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Every email address contains a tiny piece of computing history. Between a person's name and the domain sits a character that most of us type without thinking: @.It seems inevitable now. We r...
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From the air, parts of the Namib Desert look as if someone has stamped an enormous sheet of polka dots across the landscape. Thousands upon thousands of roughly circular patches of bare grou...
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High on a mountain in late spring, a patch of snow can suddenly look as though someone spilled watermelon juice across it. The surface turns pale pink, rose red or even crimson, sometimes st...
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Imagine taking the mass of a mountain and compressing it until its boundary is smaller than an atom. There would be no miniature rocky mountain inside, no visible sphere and certainly nothin...
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Few wildlife events are as disturbing as a whale stranding. An animal exquisitely adapted to life in deep water suddenly lies helpless on a beach, sometimes alone and sometimes alongside doz...
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Your passport knows exactly how old you are. Your cells are a more complicated matter. Two people born on the same day can reach middle age with very different cardiovascular health, physica...
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