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Broken Symmetry

Scientists seek mechanisms explaining development of the body’s left-right pattern.

Book Review: Stories in Stone: Travels Through Urban Geology by David B. Williams

Review by Sid Perkins.

Homage to a Pied Puzzler

Ed Pegg Jr., Alan H. Schoen and Tom Rodgers, eds.

Theo Gray’s Mad Science: Experiments You Can Do at Home — But Probably Shouldn’t by Theodore Gray

Dramatic experiments, captured in color photography with step-by-step instructions, demonstrate scientific principles from the everyday world. Black Dog & Leventhal, 2009, 239 p., $24.95. THEO GRAY’S MAD SCIENCE: EXPERIMENTS YOU CAN DO AT HOME — BUT PROBABLY SHOULDN’T BY THEODORE GRAY

From baby scientists to a science of social learning

Developmental psychologist Andrew Meltzoff codirects the Institute for Learning and Brain Sciences at the University of Washington in Seattle.