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TRY THIS AT HOME: Want to take your own pictures of Earth from the edge of the great beyond? Three MIT students launched a helium balloon—shown here during its 40-minute descent—equipped with a GPS tracker and a digital camera that captured a record of the journey from more than 28 km in the air. What’s the big deal? They did it on a budget of $150 and have created a detailed DIY guide so you can follow suit. <