Shedding light on the subject – how light or lack of it affects us
Human beings have been on earth since the Stone Age (around 100,000 years ago), and it is only in the last 200 years, following the Industrial Revolution, that billions of people have moved into cities. Way back, we lived in roving, close-knit bands following a hunter-gatherer way of life. We lived in places like the savannahs of Africa where it is hot and there are serious levels of sunlight. read more »