When Michel Siffre emerged from a lightless cave in 1962 after 63 days alone, he was stunned to learn the real date. Cut off from clocks, calendars, and sunlight, he believed it was only August 20 — nearly a month earlier than it really was. His sense of time had compressed so dramatically that two months underground had felt like little more than one.

Michel Siffre's 1962 cave experiment showed how human time perception can drift when light, calendars, clocks, and ordinary daily markers disappear. The post When Michel Siffre emerged from a lightless cave in 1962 after 63 days alone, he was stunned to learn the real date. Cut off from clocks, calendars, and sunlight, he believed it was only August 20 — nearly a month earlier than it really was. His sense of time had compressed so dramatically that two months underground had felt like little mo