Two drugs increase survival of mice even after radiation exposure. Two anti-clotting compounds already approved for use in humans may have a surprising role in treating radiation sickness. The findings, reported online today in Nature Medicine, also reveal another avenue for understanding and treating the effects of radiation exposure. Last year's nuclear accident in Fukushima, Japan, renewed anxiety over the lack of treatments for radiation poisoning. It was long thought that the effects of exposure to high doses of radiation were instantaneous and irreversible, leading to destruction of the gut and loss of bone marrow cells, which damages blood-cell production...