Population

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  can't take the heat

  Here’s how hot your city might be by 2100

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  Living

  Does your state suck at reproductive rights? Find out

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  Living

  Wondering which condoms to buy? Science has the answer

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  Living

  Map shows where the biggest couch potatoes live (and it’s NOT the U.S.!)

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  Population

  A male birth control dudes might actually use

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  Population

  Easy, reversible, 100 percent effective birth control is for men only

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  Cities

  C1ty By NuMb3r5: A formula for growing better cities

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  Climate & Energy

  Baby boomers are the worst for the climate

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  Video

  Franzen on love, sex, population, birds, and making the world less toxic