From the outside, in this upscale neighborhood east of San Francisco, all looks normal. The Valentines' family dog, DK, roams the backyard. But inside, in the spacious game room, it's a far different story. There you'll find an 8-ton, 1,500-gallon, state-of-the-art aquarium with a dozen exotic sea creatures, plus Jigsaw the shark. Jigsaw is 40 miles away from the nearest ocean.
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