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and believed it to be?

a decade later he performed a similar feat for how long in a texan cave?

in each case his free running bio rhythm settled down to one @ how many hrs?

- aschoff + wever

convinced a group of pps to spend 4weeks where?

all but one displayed circadian rhythm between?

what does this combined with siffre sugg about natural cycle?

despite this we shouldn't oversetimate influence of?

- folard et al

studied how many ppl?