Scientists at MIT have developed open-source software that can reveal details in videos that are otherwise invisible. This software — which works with videos on YouTube or DVD — can reveal the blood pumping beneath someone’s skin, with such detail that you can accurately measure their heart rate. The software could also be released for mobile devices, such as smartphones or Google Glass, so that you can see the heartbeat of those around you in real time — a boon for gamblers, FBI lie detection agents, and doctors alike.