Can being happy help me fight infection?
CrowdScience
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The Evolution of the Human Immune System
Biobacterial scientist Professor Steve Cole from UCLA says that the sort of worrying our listener does on a daily basis is prompting a response that wasn't designed for that purpose. For most of the history that shaped the evolution of the human immune system we actually lived in small communities that were pretty mobile 60 to 80 people moving around from place to place hunting and gathering. That life was pretty good hunter-gatherers it looks like spent about a third of their time socializing around the fire anotherThird of their time hunting Another Third of their time sleeping.
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