ABOVE: Ada Calvin, 7, plays with a toy frog and a bubble machine Monday at Speckled Frog Toys & Books. Shelly Cassiday-Riesenmy and her daughter Erin Babb opened the toy store about a month ago.
Michael Levin, a biologist at Tufts University, spends his days doing things such as coaxing flatworms to grow two heads or helping frogs regenerate lost legs. It may not seem like it, he says, but ...
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