http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. Average blood levels of vitamin D appear to have decreased in the United States between 1994 and 2004, according to a report in the March 23 issue of Archives of Internal Medicine. http://www.physorg.com/news157050961.html Medicine & Health Mon, 23 Mar 2009 18:17:04 EST news157050961 Downhill from the I.M. Pei-designed, Ponce de Leon-inspired and worm-saturated Buck Institute for Age Research lies the rustically tony downtown of this Marin County, Calif., city. http://www.physorg.com/news150733147.html Medicine & Health Fri, 09 Jan 2009 14:19:07 EST news150733147 Colorectal adenomas, the precursor polyps in virtually all colorectal cancers, occur infrequently in younger adults, but the rate sharply increases after age 50. Additionally, African Americans have a higher rate of proximal, or right-sided, polyps, and may have a worse prognosis for survival if the polyps become cancerous. Therefore, the results of this study further emphasize the importance of colonoscopies, which view the entire colon, for the prevention of colorectal cancer beginning at age 50. http://www.physorg.com/news139585733.html Medicine & Health Tue, 02 Sep 2008 14:48:53 EST news139585733