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Brain Game: Math Square #191

Sandy Wood

A Brief "Big History" of Salt

Chris Higgins

9 Amazing Portraits That Changed Art

Anyone can snap a selfie. These passionate artists created portraits that changed art forever.

13 Sculptures Made Out of Books

Virginia C McGuire

Books are beautiful in their own right, but these artists have managed to improve on perfection.

Last Week's Most Popular Stories

Jason English

In case you weren't obsessively refreshing mentalfloss.com all week, here's what you missed.

Weekend Links: The Real Origins of Common Adages

Roma Panganiban

Jim Henson's Home Movies Were Lovely

Chris Higgins

Entitled Run, Run, the four-minute film features Henson's daughters running in the Connecticut woods on an October afternoon in 1965.

Weekend Links: The Psychology of Scares

Roma Panganiban

A Goofy New/Old "Star Wars" Trailer

Chris Higgins

Going Viral: How Two Pakistani Brothers Created the First PC Virus

Jason Kersten

Before vigilante hackers like Anonymous tamed the Internet, two brothers started their own fight against software piracy. Their weapon: the first PC virus.

Our Most Popular Stories in October

Jason English

In case you weren't obsessively refreshing mentalfloss.com all month, here's what you missed.

The Weird Week in Review

Miss Cellania

12 Jobs People Decided to Give to Cats

Lucas Reilly

Think canines are the only four-legged creatures that can hold down jobs? Think again.

What’s the Deal with Those Last 4 Digits on ZIP Codes?

Matt Soniak

Houdini's Greatest Trick: Debunking Medium Mina Crandon

the mag

The magician is famous for his thrilling escapes, but the feat he should be known for is breaking into a séance.