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A biologist explores the world's rivers and lakes for freshwater fish that may prey on humans.

Tia Torres is a firm believer in second chances. She's dedicated the past two decades to building Villalobos Rescue Center - the largest pit bull rescue center in the U.S. Torres gives a new lease on life to dogs that were discarded, demonized and abused - often due solely to the reputation of their breed. Villalobos also has offered a fresh start to the more than 50 parolees that Tia has employed - each trying to get their life on the right track despite their also being stigmatized by society.