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

itoggle caption iStockphoto

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

itoggle caption Barcroft Media/Landov

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

Sally O'Neill decided to have a double mastectomy rather than "do a wait-and-see." Richard Knox/NPR hide caption

itoggle caption Richard Knox/NPR

Laura Molina, 9, shows the mask she created expressing the feeling of "sadness." Her mother is being treated for breast cancer at the Lyndon B. Johnson public hospital in Houston. Carrie Feibel/KUHF hide caption

itoggle caption Carrie Feibel/KUHF

Some images of lung cancer are clear cut. But in many others, a nodule on the screen turns out not to be cancer at all. iStockphoto.com hide caption

itoggle caption iStockphoto.com