Some leading scientists who have studied warfare through the ages have long suggested that humans — the males of the species, at least — have little choice when it comes to slaughtering one another in great numbers. Such warlike behavior, the scholars contend, is hardwired into the human brain. ...> Full Article
Imagine if a naturally occurring chemical in your body could help make you feel more calm and relaxed - but it would only work during the long days of summer.
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