A psychologist explains why we need to 'catch 'em all' in 'Pokémon GO'

The immensely popular mobile game “Pokémon GO” has people running all over the world to track down and capture 151 characters from the series. But why are we doing it? We spoke with a psychologist to find out what it is exactly about this game that gets people out and about and obsessed with catching them all.

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