In Dar es Salaam, Tanzania, every morning, a medical specialist known as Chewa (a name that means brave in Swahili — but his bosses call him Mchapakazi, the hard worker) gets excited about his job.

(via SciShow) We've been using lab rats for over a hundred years, and they've been part of some of the biggest medical breakthroughs ever. But what comes next? From organs on a chip to computer ...