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In theory, having a circadian rhythm should help anticipating daily environmental changes (light, temperature etc.) so that the metabolic performance is maximized. In practice, mice chronically exposed to environmental light-dark cycles with a period length dramatically shorter or longer than that of their circadian clock are prone to become obese. Moreover,...


No, this is not true. The only "organ" (if you will) that needs to "sleep" is the brain, and even then it is still quite active. The body needs to rest. When blood is needed in a prioritized manner in certain areas of the body - for example, during a marathon the muscles and the heart need more oxygen - mechanisms are in place to shunt some of the blood ...


A double-blind, prospective study during the fall of 1979 investigated the association between the menstrual cycles of 305 Brooklyn College undergraduates and their associates and the lunar cycles. .... Approximately 1/3 of the subjects had lunar period cycles, i.e. a mean cycle length of 29.5 ± 1 day. Almost 2/3 of the subjects started their ...


This example proves IMHO that migration is largely nature and not nurture: In the Netherlands, white storks were bred / reintroduced. A large part (about one third?) of the reintroduced birds do not migrate, but their offspring usually does migrate see. They couldn't have learned it from their parents, that's for sure.

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