RACHEL NUWER: ‘It was animal welfare, not conservation, that originally prompted Ken-Ichiro Kamei, a microengineer at Kyoto University, to look beyond the confines of human medicine. While studying laboratory mice at the University of California, Los Angeles, he found himself sympathizing with his four-legged subjects. “I was like, why do I need to use a … Continue reading How ‘bodies on a chip’ can transform animal welfare