Mental Floss

BIG QUESTIONS

An open road winds through colorful autumn trees in the mountains of Tennessee.

Leave it to nature to cushion the onset of cold weather with a literal golden lining. In exchange for red ears and runny noses, come fall, we get a sight for so

Nitya Rao
Skeletons and witches' feet decor in Utah

Discover the surprising history of Halloween decorations, from ancient Celtic traditions and carved turnips to the elaborate displays that adorn homes today.

Eden Gordon








Before it became everyday advice for staying alert, "keep your eye on the ball" had a much more literal origin. Here’s where the phrase really came from.

Paul Anthony Jones
Person holding a lighter to a $100 bill

The next time you feel a burning desire to torch your Benjamins, think twice. Burning money—or intentionally damaging it in any way—is illegal.

Eden Gordon








Confederate and Union soldiers fighting during the Battle of Allatoona Pass: the high-stakes battle that popularized "hold the fort."

Discover the Civil War origin behind the phrase "hold the fort," from General Sherman’s battle signals to popular gospel hymns.

Jane Alexander




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


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


The phrase “pie in the sky” has a surprisingly dark history. Learn how labor activist Joe Hill coined the expression in a song in 1911.

Paul Anthony Jones