Unusual Process Hazards: Manhole Covers

“If I had a nickel for every time this happened, I’d have two nickels. Which isn’t a lot, but it’s weird that it happened twice. Right?”  — Dr. Heinz Doofenshmirz Friends and acquaintances recently flooded my inbox with stories about a series of sewer explosions near the north riverfront of St. Louis. It launched several [...]