Which is why the Soviet government used “ultraviolet baths” to make sure that children up North got their vitamin D. https://www.nationalgeographic.com/photo-o

Which is why the Soviet government used “ultraviolet baths” to make sure that children up North got their vitamin D. https://www.nationalgeographic.com/photo-of-the-day/photo/ultraviolet-bath-mcnally-pod https://www.nationalgeographic.com/photo-of-the-day/photo/ul...