A radioactive wasp nest discovered near a nuclear waste tank at the Savannah River Site in South Carolina tested over 10 times the federal contamination limit. The U.S. Department of Energy says the nest poses no health risk,

The Department of Energy said radiation contamination levels on the wasps' nest were over 10 times the regulated maximum.

Four radioactive wasp nests may indicate previously undetected environmental contamination at the decades-old Savannah River Site. Here’s what to know.