People who live in northern climates with limited sun during the winter are often urged to take Vitamin D supplements or get exposure through special sun lamps. (petpeoplesplace.com)
This aspect of food therapy is even more important in northern climates where the seasonal change is very dramatic. (ctvsh.com)
The finding suggests that humans expanded into cold northern climates without the warmth of fire — and that cooking was not the evolutionary trigger that boosted our brain size. (newscientist.com)