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French geologist spent 205 days underground and followed a 48-hour day

French cave explorer Michel Siffre entered an Alpine cave in 1962 expecting a geological expedition, but spent 63 days testing how humans experience time without clocks or sunlight. A decade later, he repeated the experiment in Texas for 205 days, revealing how sleep and biological rhythms can drift far from…

The Times of India · Oct 6

Biological clocks: how does our body know that time goes by?

In April of this year, Spanish athlete Beatriz Flamini emerged into the light after a 500-day stay in a cave. Her descent underground is probably the longest undertaken by a long stretch. Flamini says she lost all sense of time on the 65th day. But can she really be sure…

The Conversation · Aug 31, 2023