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 ...

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 ...

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 ...