What’s the greatest mystery in the world? Is it the nature of dark matter, the origins of life on this planet, or maybe it’s whether we are alone in the universe? Or, more profound still, perhaps the ...

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NIJMEGEN, Netherlands — Ever try to tickle yourself? Go ahead, stroke your own armpit or foot sole right now. Feel absolutely nothing? That’s because your brain is playing a fascinating trick on you — ...

New study shows how tickling, playfulness can address key questions about the brain. About self-tickling. Some time after I started hormone therapy, I noticed I could tickle myself. The reaction ...