Jun 18, 2013 — Brazil has no real history of mass protests. But disgruntled youths appeared to be learning quickly, citing demonstrators in other parts of the world.

Jun 18, 2013 — Revelations about U.S. surveillance programs have not only touched off a debate in America; they've also raised privacy questions in Europe, since big Internet companies operate in both places.

Jun 18, 2013 — Fecal transplants are being used more often to treat life-threatening bacterial infections. But the Food and Drug Administration worried that the still-experimental procedure put patients at risk. Now it is dropping plans to restrict transplants after doctors and patients complained.

Jun 18, 2013 — FBI agents believe they have a credible lead on the whereabouts of Jimmy Hoffa's body. If they're right, it will solve a longstanding mystery, which will also deflate Hoffa's resonance in popular culture.

Jun 18, 2013 — Conventional wisdom holds that men prefer younger women as mates because they're more fertile than older women. But a mathematical analysis suggests that this preference may be the cause of menopause rather than a consequence of it.