Valuable Rare Blunders

The 1918 mistake known as the Inverted Jenny is highly sought after, and at least one has sold for well over a million dollars. What is an Inverted Jenny? Answer: …

Bringing it Back

A technique for dislodging objects when someone is choking using abdominal thrusts was named after the man who first published the maneuver in 1974. What is this technique called? Answer: …

Mouse Tracks

The first computer mouse, or “X-Y position indicator for a display system”, was patented in 1970 and appeared on the Alto computer system in 1973. What company produced the Alto? …

The Hole Story

What do you call the depression left behind after a volcano explodes and it falls in on itself because it’s magma chamber is empty? Answer: Caldera