Though an estimated 60 million people around the world have atrial fibrillation, or A-fib, a type of irregular and often fast heartbeat, it’s been at least 30 years since any new treatments have been developed. This is because researchers haven’t had accurate models of the human heart to study. Thanks to new developments from Michigan State University scientists, that is no longer the case.

Study is first to show how tanning beds mutate skin cells far beyond the reach of ordinary sunlight