http://phys.org/ en-us Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. A new Northwestern University study suggests that American parents should ease up on antibacterial soap and perhaps allow their little ones a romp or two in the mud --- or at least a much better acquaintance with everyday germs. http://phys.org/news179522243.html Medicine & Health Tue, 08 Dec 2009 19:18:02 EST news179522243 Millions of "natural killer cells" -- nature's first line of defense against cancer, viruses and other infectious microbes --- are on constant patrol inside your body. http://phys.org/news154541184.html Medicine & Health Sun, 22 Feb 2009 16:07:11 EST news154541184