Researchers in Europe have made advances with a new technology that could one day be used to detect explosives or biological weapons in parcels, locate cancers beneath the skin, reveal the state of wounds beneath dressings and see through fog. As part of an effort sponsored by the European Space Agency, which works to bring the continent up to speed in outer-space research by coordinating multinational projects, scientists were able to take the first "photographs" using terahertz radiation. Researchers with the StarTiger project released on Tuesday images of a human hand taken through a 15 millimeter stack of paper, as...