David Ross, also known as Waterman Dave, hands out bottled water and energy drinks from his trunk in San Diego. The 75-year-old retiree has made it his mission to help the homeless — even if it's just with a hug or a kind word.
Pam Fessler/NPR
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On this week's podcast we hear about needle biopsies, a less costly and less invasive alternative to surgical biopsies for breast cancer.
National Cancer Institute
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