July 2, 2013 Nuclear bomb tests in the 1950s and '60s pumped a lot of radiocarbon into the atmosphere. It went everywhere, including into plants that elephants eat. By measuring the levels of this carbon in elephant tusks, scientists can tell when an elephant died — and whether the ivory is being traded illegally.
July 2, 2013 Traditional hearing aids can be too expensive for many people. But a new type that uses Bluetooth technology costs only about $300. The company that makes the new devices aims to reach millions of people around the world who need hearing aids but have trouble paying for them.
July 2, 2013 Many violent crimes are hastily planned and poorly considered, researchers at the University of Chicago's Crime Lab find. Training troubled teens to slow down and put a more benign spin on what they imagine the other guy is thinking significantly reduced the kids' likelihood of committing a crime.