When the deformed frogs were first discovered by Minnesota schoolchildren in 1995, scientists hoped they might find the cause in a matter of months. But as more frogs were found, and the frogs attracted national and even international attention, the Environmental Protection Agency got involved. Now experts say it make take three to five years to find out what caused the deformities. Minnesota Public Radio's Mary Losure is at an EPA conference on the frogs, in Shenendoah National Park in Virginia.