Add Yahoo as a preferred source to see more of our stories on Google. A manhole cover launched into space with a nuclear test is the fastest human-made object. A scientist on Operation Plumbbob told ...

ST. JOHNS COUNTY, Fla. — Manhole inspections and smoke testing of the sanitary sewer system started in St. Johns County on Monday. Smoke testing is performed periodically to identify sources of ...

Robert Brownlee was on the Operation Plumbbob team that launched an object in space before Sputnik. They put a manhole cover above a nuke underground, and the explosion shot the iron cap into space.

Smoke testing is performed periodically to identify sources of stormwater inflow and/or groundwater infiltration entering the city’s sewage collection system, according to a news release. Here is the ...