The buzz about radioactive wasps at a Cold War-era nuclear site in South Carolina just won’t die. Investigators found “hot” nests inside a nuclear weapons facility in South Carolina, with scientists warning it could be evidence of either a leak or contamination that wasn’t previously detected.

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

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