In 1972, French geologist and speleologist Michel Siffre embarked on one of the most fascinating human experiments ever attempted. He spent six months completely alone in a cave in Del Rio, Texas, with no sunlight, no clocks, and no contact with the outside world. Cut off from all external cues, Siffre lost track of time entirely, sleeping and waking according to his body’s natural rhythm rather than day and night. What he discovered reshaped our understanding of circadian biology, showing how t
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