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Attention all wannabe sea creatures: you can buy a mermaid tail on the internet now, and it's nothing like the little kid costumes you're picturing in your head. No, no, these babies are authentic.

Jack Laflin likes to recall the time he wriggled into a 9-foot-long, 30-pound blue mermaid tail. He’d spotted similar pieces behind the scenes of the acting gigs he was trying to land, but this was ...