Workers at South Carolina's Savannah River Site, a nuclear facility, found a radioactive wasp nest with radiation levels 10 times higher than federal regulations allow.

Workers at a site in South Carolina that once made key parts for nuclear bombs in the United States have found a radioactive wasp nest but officials said there is no danger to anyone.

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