Bioengineering professor Manu Prakash brought the world a 50-cent microscope. Now he’s created more cheap public health tools, including a paper centrifuge and a mosquito identifier. And he’s just getting started.

When 12-year-old Peyton Robertson sees a problem, he is going to fix it. So when the young scientist noticed a perennial problem in his hometown of Fort Lauderdale, Florida –flooding during the region’s nasty hurricane season – he set to work building a better sandbag. Peyton’s sandbag contains an expandable polymer that’s lightweight and easy […]