Five Best Ideas of the Day
Published each weekday, at noon.
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Here’s how treadmills made the unlikely leap from the prison to the gym.
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How the unique biology of dolphins could help humans avoid the bends.
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The Army can’t find training facilities big enough practice for war in megacities.
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The world’s multilateral institutions must prove their value to people who’ve missed out on the benefits.
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Rising carbon levels might slash the nutritional value of one of the world’s staple crops.