Most balls slowly but consistently lose air. But this ball maintains perfect pressure for at least a year-10 times as long as standard balls. The magic: It's injected with seepage-fighting molecules that form a protective membrane against the natural pores in the bladder. $40
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Inside NASA's astronaut bootcamp and the grueling new training regimen for deep space. Plus, ten young geniuses shaking up science today, one writer's quest to analyze every man-made chemical in her body and more.
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