How much do you know about One Direction? (Getty Images)

If you hear unearthly keeningcoming from Nationals Park on Monday, don’t be alarmed. That’s just the sound of a few thousand girls melting down at the sight of the British boy band One Direction. And though the five guys in One Direction are reportedly on their way to earning $1 billion from touring this year, most people outside their target market could pass them on the street without noticing. Of course, your preteen daughter would never forgive you if that happened.

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