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Alan Dambach developed tremors that caused his hands to shake uncontrollably. His condition made it difficult to work on his family's tree farm in Fombell, Pa. Ross Mantle for NPR hide caption

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Ross Mantle for NPR

How Highly Focused Sound Waves Steadied A Farmer's Trembling Hand

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Breasts deemed "dense" in a mammogram tend to have less fatty tissue and more connective tissue, breast ducts and glands, doctors say. About 40 percent of women between the ages of 40 and 74 have dense breasts. Lester Lefkowitz/Getty Images hide caption

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Lester Lefkowitz/Getty Images