People practice yoga at a fundraiser for a breast cancer foundation in Hong Kong. Ed Jones/Getty Images hide caption

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4-MEI, a chemical created during the manufacturing of caramel color used to dye sodas brown, is under new scrutiny. iStockphoto hide caption

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The sexually transmitted cancer is common in street dogs around the world. Noel Celis/AFP/Getty Images hide caption

itoggle caption Noel Celis/AFP/Getty Images

Though some people might need more of specific vitamins, multivitamins don't help most people, studies say. iStockphoto hide caption

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Michael Robertson, then chief of staff of the Government Services Administration, testifies on Capitol Hill on April 16, 2012. Now chief of staff of the Cabinet Affairs Office in the Obama administration, Robertson has undergone treatment for stage IV colorectal cancer. Chip Somodevilla/Getty Images hide caption

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A woman is positioned for a traditional mammogram at Tufts Medical Center in Boston. Bizuayehu Tesfaye/AP hide caption

itoggle caption Bizuayehu Tesfaye/AP

Barbara King rings the "victory bell" and holds up a certificate celebrating her completion of 25 external radiation treatments. Courtesy of Charles Hogg hide caption

itoggle caption Courtesy of Charles Hogg

French fries: There are probably other reasons besides acrylamide to avoid these tasty snacks. iStockphoto hide caption

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Given how little we understand about the roots of consciousness, it simply doesn't make a whole lot of sense to make commitments one way or the other when it comes to questions of what exactly dies and how. Duncan P. Walker/iStockphoto hide caption

itoggle caption Duncan P. Walker/iStockphoto

The human papilloma virus causes most cervical cancers. That's why HPV testing is now recommended for women ages 30 to 65. Science Photo Library hide caption

itoggle caption Science Photo Library

Tina Nevill of Essex, England, holds Poppy, who was conceived by in vitro fertilization. The U.K.'s health system records all IVF cycles performed in the country. Barcroft Media/Landov hide caption

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Dr. Jim Olson meets with Carver Faull at Seattle Children's Hospital in August. Carver, now 12, had surgery to remove a brain tumor in 2012. Matthew Ryan Williams for NPR hide caption

itoggle caption Matthew Ryan Williams for NPR

The image on the left is a piece of lung tissue that contains a tumor viewed under normal white light. The right image shows the same piece of tissue after Tumor Paint has been applied. Here it's viewed under infrared light. Areas that are more red and yellow show a concentration of the paint, which means they are more likely to be cancerous. Courtesy of Julie Novak/Blaze Bioscience hide caption

itoggle caption Courtesy of Julie Novak/Blaze Bioscience