Categories Articles A manhole cover launched into space with a nuclear test is the fastest human-made object. A scientist on Operation Plumbbob told us the unbelievable story. Post author By crystalg Post date March 2, 2023 Business Insider Business Insider… Tags Cover, Fastest, humanmade, into, launched, Manhole, Nuclear, Object, Operation, Plumbbob, Scientist, space, Story, test, Told, Unbelievable