Transcript for scene 5 of the video " Ice Age of the dimmer Sun in 30 years - 8 Dawn of humanity" by Rolf Witzsche  

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A type of nourishment for mental development

This means that the universe has given us a great gift by providing two distinct environments that in conjunction have aided the development of humanity on two critical fronts alternately. The glaciation periods furnish an environment that provides a type of nourishment for mental development, with a high rate of galactic cosmic-ray flux, while the interglacial warm periods furnish an environment for easy living with plenty of food available, under a brilliant Sun. Both aspects appear to be needed for the advance of human development. It may be that the dawn of humanity did not begin until both conditions were established.

The critical conditions simply didn't exist until the ice ages began.

 

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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche