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Never mind the physics. Color isn't just a particular wavelength of light, it turns out. It's a fascinating mix of context and what's happening outside and inside your head.

One of Robert McDonald's challenges is to get more doctors to work for the Department of Veterans Affairs. Another is to make the agency's structure easier for veterans to navigate.

Access to breast-milk banks is a problem in the developing world. A smartphone accessory could save lives by allowing health workers to set up mini milk banks anywhere.

SugarScience, a website created by researchers at the University of California, San Francisco, distills the findings of 8,000 scientific studies on the health effects of sugar. The takeaway? Eat less.

Can you run a clinical trial without a placebo group? That's one of the questions facing researchers in West Africa.

Gen. John Campbell leads the U.S. forces in Afghanistan. On Veterans Day, he offers his assessment of the war as the U.S. winds down its presence and hands over responsibility to the Afghans.

Obama announced at the Asia-Pacific Economic Cooperation summit that the U.S. and China reached an "understanding" that will lead to expanding goods covered by the Information Technology Agreement.

Gun-rights advocates have enjoyed recent victories, and made it easier to buy and carry firearms in many states. A campaign has sprung up to ease restrictions on a different weapon: switchblades.

The existing tariff system, which adds as much as 25 percent to the cost of American high-tech exports, covers more than $4 trillion in annual trade, the White House says.

Consumers can sign up for health insurance through the online marketplaces anytime from Nov. 15 to Feb. 15. But waiting can trigger medical bills and the health law's penalties.