THE KNOWLEDGE FEED

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The Number of the Day: 42,000

Will Treece

The number of tennis balls used at Wimbledon is roughly 42,000. Related Fact: According to The Telegraph, 1,540 gallons of cream consumed by Wimbledon patrons each year.

The Cemetery Where They Clean the Bones

Ransom Riggs

Maid service is included for the residents of Pomuch Cemetery in Campeche, Mexico, where a tradition dating back to Mayan times makes for a really memorable Dia de los Muertos.

Brain Game: Math Square #30

The nine white squares inside the main red grid should be filled with the digits 1 through 9. Each digit should appear only once in this main grid. Two of these numbers are already provided for you.

Morning Cup of Links: Subtle Subtitles

Miss Cellania

Thomas Edison and Henry Ford came close to producing an electric car nearly 100 years ago.

The Weekend Links: Sunday Edition

Allison Keene

This popular game of mathematical raindrops reminds me a lot of flashcards.

Last Week's Most Popular Stories

Jason English

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

Sneak Peek #4: The Prettiest Slum of Tomorrow

Mangesh & Jason

The new issue hits stands next Tuesday, and the cover story features the 50 Most Interesting Places in the Space-Time Continuum.

The Weekend Links: Saturday Edition

Allison Keene

Reading mental_floss on a regular basis might not make you addicted to the internet (or it might!), but the truth is, according to this infograph, our usage and dependency in general has skyrocketed i

The Quick 10: Actors Who Shared the Spotlight With Dad

Stacy Conradt

Can you imagine going to work with your dad every day? Maybe you already do. My dad works for the railroad and I can't really picture myself out there helping him repair tracks.

Lunchtime Quiz Leftovers

Jason English

The Late Movies: Schrödinger's Cat

Miss Cellania

Schrödinger's Cat is the name of a thought experiment in quantum mechanics that posits that an unknown exists in more than one state until it is observed.

Sneak Peek #3: The World's Nicest Landlords!

Mangesh & Jason

The new issue hits stands next Tuesday, and the Spinning the Globe section on Bolivia is fascinating. From its two national capitals, to a month-long fight club, the stories are fascinating.

Sneak Peek #2: The Dirty Side of Marching Bands

Mangesh & Jason

The new issue hits stands next Tuesday, and we thought this story might intrigue our fellow band nerds in the audience.

How Come You Never Got an "E" in School?

Matt Soniak

With most schools in the US about to let out for the summer, reader Sarah in California had report cards on her mind. She wrote to ask how letter grades originated, and why no one ever gets an

Sneak Peek #1: Even the Government's Peanut Butter is Expensive!

Mangesh & Jason

The new issue hits stands this Tuesday, and we thought we'd get things started with a little sneak peek on our peanut butter spread (that's 2 pages full of weird facts you need to know about

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