In the 1960s, counterculture hippies were urging us to give peace a chance (great advice). To expedite that process, it was helpful to have “good vibrations”—considered so important that the Beach Boys wrote a catchy song with this title. It was easy to tell who had good vibes and who didn’t. An optimistic, considerate person was considered “high frequency,” while a pessimistic, disagreeable indi- vidual was “low frequency.” Not surprisingly, everyone wanted to be around the folks who had good vibes.

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