Every year in the US there are some 600,000 knee replacement surgeries. But a team at Duke University might help some people avoid those surgeries with a hydrogel that can stand in for cartilage. Plus: engineers at NIKE develop a ball that can really soar. 

From The Lab, The First Cartilage-Mimicking Gel That's Strong Enough For Knees (Duke University)

NIKE's new flight ball promises a 'revolution in football aerodynamics'  (designboom)

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