Ronald Davis cares for his 31-year-old son, Whitney Dafoe. Dafoe is seriously ill with ME/CFS. His father, a Stanford University professor, is organizing a study of the disorder. Courtesy of Ashley Davis hide caption

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A simulation from the Neitz lab of what colorblindness looks like, with normal color vision on the left and red-green colorblindness on the right. Courtesy of Neitz Laboratory hide caption

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Feces contain digested food residue and a wide variety of microorganisms, mostly bacteria, that are adapted to life in the intestines. The gases the microbes produce could help doctors and scientists track and understand changes related to health. Scimat Scimat/Photo Researchers/Getty Images hide caption

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Marder says immunotherapy has side effects but is less tiring than chemotherapy. Claire Eggers/NPR hide caption

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You don't want to run into methicillin-resistantStaphylococcus aureus (MRSA) bacteria. A potential new antibiotic could help fight this bug. CDC hide caption

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By increasing the amount of serotonin in the spinal cord, an experimental drug helps nerve connections work better. Bee Smith/Ocean/Corbis hide caption

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Justin McCowan poses for a portrait outside of his house in Santa Monica, Calif., on Aug. 14. Benjamin B. Morris for NPR hide caption

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I'm not trying to lead you astray. It's just that scientists are not skeptical enough about their mouse studies. iStockphoto hide caption

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President Obama has pledged millions of dollars to fuel research into understanding the workings of the human brain. Zephyr/Science Source hide caption

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