The best explanation of stress we've ever heard comes from Stanford neurobiologist Robert Sapolsky, PhD, the author of Why Zebras Don't Get Ulcers. "If you are a normal mammal," he notes, "stress is the three minutes of screaming terror on the savanna after which either it's over with or you're over with."
If you're a human mammal, stress comes not from fear of being eaten but worry about somebody eating your lunch. Unlike other animals, we have a large brain relative to our body size—a brain...
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