Philippe Matthews Show Guru Advice, Author Reviews, Tech Reviews, Entertainment News

By Virginia Gewin of Nature magazine A new screening test makes use of urine, rather than blood, to identify the men most at risk of prostate cancer, and may even provide information about how aggressive a tumor is likely to be. The standard screening test for prostate cancer is a blood test for a protein called prostate specific antigen (PSA)

By Melissa Gaskill of Nature magazine The 1,000 kilometers of impenetrable barrier constructed along the Mexico-United States border, with the aim of stemming illegal human immigration, is also hampering the movements of animals, including several endangered species, a recent study finds. The species most at risk are those with smaller populations and specialized habitats, says Jesse Lasky, a graduate student at the University of Texas, Austin, and an author on the study, published in Diversity and Distributions

Dr. Jennifer Ashton spoke with Erica Hill on who is most at risk of radiation exposure after Japan's Fukushima Dai-ichi nuclear power station experienced a partial meltdown.