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Karen Lindsfor, a professor of radiology and chief of breast imaging at the University of California, Davis Medical Center, examines the mammogram of a patient with heterogeneously dense breast tissue. Lindfors is among those doctors who say there was insufficient evidence to support the idea that additional screenings would detect cancers earlier. Rich Pedroncelli/AP hide caption

itoggle caption Rich Pedroncelli/AP

Budding scientists, engineers and doctors lined up to try surgical robots from Intuitive Surgical at a science festival in Washington, D.C., over the weekend. Scott Hensley/NPR hide caption

itoggle caption Scott Hensley/NPR

People who are interested in and paying close attention to each other begin to speak more alike, a psychologist says. iStockphoto.com hide caption

itoggle caption iStockphoto.com

The Colorado Coalition for the Homeless runs the Stout Street Clinic in Denver, helped Dale Miller get a CT scan. Colorado Coalition for the Homeless hide caption

itoggle caption Colorado Coalition for the Homeless

Come summer, mailboxes of 1 in 3 buyers of individual health insurance buyers could get rebate checks. JS Callahan/tropicalpix/iStockphoto.com hide caption

itoggle caption JS Callahan/tropicalpix/iStockphoto.com

Staying fit and eating well can help cancer survivors, too, a review of the latest evidence shows. Lucy Pemoni/AP hide caption

itoggle caption Lucy Pemoni/AP

Dr. Mitch Katz rides his bike to work, defying the commuting norm in Los Angeles. Michael Wilson/L.A.County Health Services Dept. hide caption

itoggle caption Michael Wilson/L.A.County Health Services Dept.