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In 2008, the International Association of Athletics Federations (IAAF) banned double amputee Oscar Pistorius from racing in the 2008 Summer Olympics. Later that same year, the ban was reversed. The back and forth centered on Pistorius' specially designed, spring-loaded, prosthetic legs. The IAAF argued that artificial legs designed especially for running gave Pistorius an unfair advantage against runners whose flesh-and-blood limbs didn't benefit from advanced engineering and space-age materials.

While an MIT study last year eventually led to the overturn of the original IAAF decision, no one had done a systematic study of amputee racers in general. Now, the MIT researchers that investigated Pistorius have released the results of a wider trial, and it turns out that specially designed prostheses don't actually help sprinters.

Trash becomes invisible to most people as soon as they haul their trashcans out to the curb. Now MIT wants to change that by using tiny smart tags that will broadcast the location of 3,000 pieces of rubbish as they travel through the urban ecosystem and beyond.

Track Anyone With a Cell

Cost: $100
Time: 4 Hours
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