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Cows that consume feed, grass or water contaminated with radioactive iodine-131 can concentrate the element in their milk. Peter Elvidge/iStockphoto.com hide caption

itoggle caption Peter Elvidge/iStockphoto.com

David Wilson of Florida, with the Stop Infant Circumcision Society, works on a readies a sign for a protest in Washington last March. Tom Williams/Roll Call/Getty Images hide caption

itoggle caption Tom Williams/Roll Call/Getty Images

Moshe Rute smokes marijuana at the Hadarim nursing home in Kibutz Naan, Israel, in early March. The Israeli government and a private company are distributing cannabis for medicinal purposes to more than 1,800 people in Israel. Uriel Sinai/Getty Images hide caption

itoggle caption Uriel Sinai/Getty Images

Wasabi plants, like these, in Fukushima prefecture were found to contain substantial amounts of radioactive iodine. C.K. Koay/Flickr hide caption

itoggle caption C.K. Koay/Flickr