BLOG

When cave explorer Michel Siffre  descended into an ice cave in the French Alps in 1962, he had neither a clock nor a calendar with him. His aim was to see how human perception of time would change when completely isolated from the outside world. Siffre lived in pitch darkness for weeks. He turned on the lights when he woke up, ate his meals, and slept when he felt sleepy. The results were staggering: Although there were no external stimuli, Siffre's body managed to maintain