Thirteen years ago, researchers at the United States Holocaust Memorial Museum began the grim task of documenting all the ghettos, slave labor sites, concentration camps and killing factories that the Nazis set up throughout Europe. What they have found so far has shocked even scholars steeped in the history of the Holocaust. he researchers have cataloged a staggering number of Nazi ghettos and camps throughout Europe: 42,500. read more
Feb. 27, 2013 -- While water bottles may tout BPA-free labels and personal care products declare phthalates not among their ingredients, these assurances may not be enough. According to a study published February 27 in the Nature Journal of Exposure Science and Environmental Epidemiology, we may be exposed to these chemicals in our diet, even if our diet is organic and we prepare, cook, and store foods in non-plastic containers. read more
Abstract: Teleportation of optical qubits can enable reliable logic operations in massively parallel quantum computers, as well as the formation of secure quantum networks. Photon teleportation has previously used laser-generated entangled photons created in random quantities. However, the practical complexities of the generating scheme coupled with errors caused by multipair emission have complicated its deployment in useful quantum information technology. Here, we demonstrate teleportation of single photonic qubits, mediated by individual pairs of entangled photons generated by an electrically driven entangled light source realized by embedding a single semiconductor quantum dot within a light-emitting diode. read more
Eighty four percent of fish have unsafe levels of mercury, a new study from the Biodiversity Research Institute in Maine finds. This poses a health risk for humans, exceeding the guidelines for eating certain kinds of fish more than once a month. Reducing mercury pollution is on the agenda of the United Nations conference this week in Geneva. "Seventy-five percent of the fish we eat in the United States is imported," said Linda Greer of the National Resources Defense Council. "Many of the tuna fish we eat, for example, swim in the South China Sea, and that's mercury pollution that comes into cans and into our pantries every day."
In loop quantum gravity, spacetime emerges from excitations of an ultimate vacuum. read more