This Guy Lived in a Cave for 63 Days

Imagine thinking you’re just studying rocks, but you end up discovering that humans have a secret internal clock! Michel Siffre went underground for over two months—no sunlight, no clocks, no contact—and totally lost track of time. Turns out, our bodies start making up their own schedules when we’re cut off from the outside world. His wild experiment basically kicked off the science of chronobiology, which now helps everyone from astronauts to shift workers. Who knew caves could mess with your mind like that? #Chronobiology #ScienceFacts #MindBlown #Science