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.
After examining dozens of Ice Age cave sites across Europe, paleo-archaeologist Genevieve von Petzinger found our ancestors used a small group of signs in common. Here, she walks us through her eye-opening discoveries and their implications.