Duke University

Effortless sailing with fluid flow cloak

Duke engineers have already shown that they can "cloak" light and sound, making objects invisible -- now, they have demonstrated the theoretical ability to significantly increase the efficiency of ships by tricking the surrounding ...

Aug 11, 2011 4.4 / 5 (10) 19 | with audio podcast

Why mercury is more dangerous in oceans

Even though freshwater concentrations of mercury are far greater than those found in seawater, it's the saltwater fish like tuna, mackerel and shark that end up posing a more serious health threat to humans ...

Jun 27, 2010 5 / 5 (8) 0 | with audio podcast