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HIV is like a jack-in-the-box. When the viruses bump into particular cells in the immune system, the viruses' shells pop open and their genes enter the cells. Experimental therapies for HIV could stop the virus from getting in.

The defending gold medalist, said the decision to bow out was one of the "saddest days" of his career.

Clinicians on the front lines say HIV treatment could help end the AIDS pandemic by curbing infections. Studies have found that HIV drugs make a person less likely to transmit the virus to others because they decrease the level of virus in the body.

Greek yogurt sales are booming in the U.S., and some companies are turning to new technology to get in on it. But some Greek yogurt purists who compete with those companies for market share say the products are not the same.

Syria is thought to have the most advanced chemical warfare program in the Arab world.

The agency's inspector general said it was launching an investigation into the expenditures of a one-day conference.

Content in the free online encyclopedia Wikipedia can be generated and edited by anyone. But the power to delete or lock those entries lies in the hands of the site's "administrators." A rigorous screening process for new administrators has partly led to a drop in site participation. Now, Wikipedia is struggling to find new editors.

In 2008, "Boston" Bill Hansbury was learning to live with a prosthetic leg when he met Jake Bainter, who was about to have his right leg amputated. The two struck up a friendship, despite their wide age gap: Hansbury was 70, and Jake was 7.

The country's army swore oaths of loyalty to leader Kim Jong Un after he was given the new title of marshal of the nation. This follows the army chief's dismissal. Analysts suspect the announcements mask far deeper changes, but there's disagreement about what those changes are.

Numbers from state and local governments suggest their public pension plans are underfunded by about $1 trillion. New accounting rules are about to make that gap between what they owe and what they have on hand look bigger — much bigger, in some cases.