 Quote by Reality_Patrol
*SNIP
Humans are photoperiodic, as are all mammals. As our modern environment severely alters the natural photoperiod our physiology is negatively impacted.
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Are there any humans whose environment does not severely alter the natural photoperiod, with physiology not (much) negatively impacted? For example, there are still a few million who live a life of hunting and gathering, and a few more million in nomadic herding.