Emergency links: NIST identifies 'sweet spot' for radios in tunnels
(National Institute of Standards and Technology (NIST)) Researchers at NIST have confirmed that underground tunnels -- generally a difficult setting for radios -- can have a frequency "sweet spot" at which signals may travel several times farther than at other frequencies. The finding may point to strategies for enhancing rescue communications in subways and mines.
Barack Obama said his plan to end the Iraq war was unchanged and he was puzzled by the sharp reaction to his statement that he might "refine" his timetable for withdrawing U.S. combat troops.
AFP - The United States military wanted to test deadly nerve gases on Australian troops in a remote area of far north Queensland in the 1960s but Canberra refused, a report said Sunday.
