If Mars can come within roughly 55 million kilometers of Earth, why does a spacecraft sent there travel something closer to 480 million kilometers — and spend around seven months doing it? The answer is one of the most important ideas in sp...
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Science-fiction space battles have trained us to expect a particular soundtrack: engines roar, lasers crack and exploding spacecraft detonate with a cinematic boom. Put the same battle in th...
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You are almost asleep when the floor seems to disappear. For a fraction of a second, your body feels as though it has stepped off a ledge. A leg kicks, an arm jerks or your whole torso jumps...
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A cat is calmly eating from its bowl. While its attention is elsewhere, someone quietly places a cucumber on the floor behind it. The cat turns, sees the vegetable and suddenly launches itse...
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Few breakfast foods come with a better internet story than Corn Flakes. According to the version repeated across social media, Dr. John Harvey Kellogg invented the famously plain cereal in t...
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You are walking past a town hall, courthouse, school or government building when something looks slightly wrong: the flag is not at the top of its pole. It is hanging lower, leaving an unmis...
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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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Dig beneath a forest and the roots are not alone. Wrapped around them, penetrating them and extending far beyond them are microscopic fungal threads called hyphae. Together those threads for...
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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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