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Salim S. Abdool Karim and Quarraisha Abdool Karim/ Photo: Courtesy of Caprisa

New gel reduces women’s risk of HIV

A new anti-HIV gel has been found to be safe and effective at lowering the chances of infection.
Elena Aprile

What holds us together?

Physicist Elena Aprile is close to spotting dark matter.

Sandro Galea

Wired for trauma

Epidemiologist Sandro Galea discovers that altered genes may trigger post-traumatic stress.

Ovarian cancer cells

Fertility hope for ovarian cancer patients

New research suggests that women with early-stage ovarian cancer may have more choices.
Former U.S. Army Sgt. Kristofer Goldsmith / Photo: Somodevilla / Getty Images

Casualties of war?

Suicides among U.S. Army personnel today are at their highest levels since the military began keeping records 30 years ago.