Mental Floss

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Ever wondered why a secret advantage is called an "ace in the hole"? Discover the 19th-century poker origins behind this iconic idiom.

Paul Anthony Jones








A medieval stone gargoyle on the exterior of Germany's Gothic Freiburg Minster.

Long before it described cathedral arches, spooky novels, or head-to-toe black clothing, calling something "Gothic" was a major insult. Here is how Renaissance art critics turned a Germanic tribe’s name into a centuries-long slur.

Jane Alexander


The Prague Astronomical Clock, first installed in 1410.

Ever wonder why we say "o'clock"? Discover the medieval origin of the phrase, how mechanical clocks changed timekeeping, and why the contraction stuck.

Nitya Rao