Making a dent in the climate crisis is going to take more than solar panels and recycled toilet paper. Scientists are finding ever more creative ways (pig pee! DIY tornadoes! mini nuclear reactors!) to clean up the Earth

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Last January, an Australian engineer announced a bizarre new contraceptive for men: a radio-controlled implant that could block the flow of sperm with the click of a button. The device, which is still in the conceptual stages, is the latest in a growing number of experimental male birth-control methods—including sperm plugs, sperm dissolvers and heat-inducing gels—that don’t tinker with testosterone.

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Putting food back in the freezer after it thaws causes ice crystals to grow, imparting the unwelcome crunchy texture and mildew-like taste of freezer burn. Now food chemist Srinivasan Damodaran of the University of WisconsinMadison has derived an edible antifreeze from papaya enzymes and gelatin. His concoction, which stunts ice-crystal growth, promises always-creamy ice cream and juicier T-bones, even after their third trip between icebox and table.

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