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Fallout: New Vegas - News Roundup #2
TL;DR
Original Sin Donor
Original Sin 2 Donor
Not only this. It seems they are cause a *lot* more, especially in termsf social behaviour.
Ever wondered why if someone yawns, soon the entire environment has a strong tendency to yawn, too ? - Could be mirror-neurons, then.
Or maybe herd behaviour, too. Like panicking, for example.
This is just too young to be well studied.