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No matter how well designed, there are no running shoes that allow runners to keep up with cyclists. The bicycle was a key invention that doubled human-powered speed. But what if a new kind of shoe could allow people to run faster by mimicking cycling mechanics?

Many African countries now require people to wear a mask when out in public. This is part of the effort to stop COVID-19 from spreading. Cloth masks reduce the number of droplets that are spread into the environment when people breathe, cough or sneeze.