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Your link to sports history, one photo at a time. Curated by Andy Gray and Dave Kaye.

SI has compiled the best polar bear plunges of 2013. Are you ready to take the plunge? (AP)

GALLERY: Polar Bear Plunges of 2013

SI has compiled the best polar bear plunges of 2013. Are you ready to take the plunge? (AP)
GALLERY: Polar Bear Plunges of 2013