Evidence of radiation contamination from the nuclear reactor in Fukushima, Japan is showing up in milk and spinach, but scientists' predictive capacities have been left wanting. "When and where radioactive contamination becomes a problem depends on a vast array of factors: the specific element released, which way the wind is blowing, whether rain will bring suspended radioactivity to earth, and what types of crops and animals are in an exposed area. Research related to the 1986 Chernobyl accident makes clear that for decades, scientists will be able to detect the presence of radioactive particles released by the crippled Japanese reactors thousands of miles away."