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For all the good aspirin can do in preventing second heart attacks and strokes, taking it daily can boost some risks, too — of ulcers, for example, and of bleeding in the brain or gut. iStockphoto hide caption

itoggle caption iStockphoto

Mmm. Smells just like your identical twin. iStockphoto hide caption

itoggle caption iStockphoto

A direct, friendly gaze seems to help cement the bond of affection between people and their pooches. Dan Perez/Flickr hide caption

itoggle caption Dan Perez/Flickr

NPR intern Poncie Rutsch takes a crack at making a big sound. Meredith Rizzo/NPR hide caption

itoggle caption Meredith Rizzo/NPR

To sleep, perchance to consolidate important connections in far-flung parts of the brain. Alberto Ruggieri/Illustration Works/Getty Images hide caption

itoggle caption Alberto Ruggieri/Illustration Works/Getty Images

Some researchers recommend starting mammogram screening at age 40, while others say age 50. Some doctors think screening should be based on a woman's overall risk for breast cancer, not just her age. Hero Images/Corbis hide caption

itoggle caption Hero Images/Corbis