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Explaining SPF (And Why Sunscreen Should Be Measured by the Shot)

Ethan Trex

As the spring heats up, more and more of us will be slathering on sunscreen before heading outside to enjoy the weather. What SPF should we look for? And what does that number actually mean, anyway?

What Does the Q in Q-Tips Stand For?

Jason English

If you followed @mental_floss on Twitter, you'd know.

This Tetris Documentary Will Rock You

Chris Higgins

So I'll go ahead and assume you're aware of King of Kong, the videogame documentary that chronicles an epic struggle to dominate the game of Donkey Kong.

Graduation Special: All Shirts $14.90!

Mangesh & Jason

Ditch the boring graduation robes this season and step out in style. This week, mental_floss t-shirts are just $14.90!

Create Your Own Unit of Measurement (And Win!)

Jason English

© Joe Giron/Corbis We recently discussed a few unusual units of measurement, including the Wheaton (500,000 Twitter followers) and the milliHelen (the quantity of beauty required to launch a single

The Buttered Cat Paradox

Miss Cellania

Buttered toast always lands butter-side-down. A cat always lands on its feet. What would happen if you attached toast to a cat's back, butter side out?

Brain Game: DC Follies

I got on a roll after compiling yesterday's Presidential Middle Names quiz, so here's a related Think Thursday challenge for the mentalfloss.com Brain Game.

Morning Cup of Links: Spies and Crossbones

Miss Cellania

Women Spies of the Civil War. They also serve who snoop and risk their lives away from the battlefield. * More misspelled food. And some more. So Stupid you have to laugh.

The White House Prom of '75

Stacy Conradt

Remember the time you held a raging party at your house when your parents were out of town? Susan Ford did that, too.

The Late Movies: Lin-Manuel Miranda Raps on The Electric Company

Chris Higgins

Lin-Manuel Miranda came to my attention when he rapped about Alexander Hamilton.

8 Things You Might Not Know About Paul McCartney

Eddie Deezen

Whether with The Beatles, Wings or solo, Paul McCartney has given us scores of classic songs that will live on through the ages, as long as music is enjoyed.

This Machine Really Doesn't Want to Be Used

Chris Higgins

Last year I pointed to some machines that turn themselves off -- these are called "Ultimate Machines," and generally take the form of a box with a switch.

How the People of Green Bay Came to Own the Packers

Ethan Trex

© Mark Cowan/Icon SMI/Corbis At some point during each NFL season (or protracted NFL lockout), fans are bound to hear an announcer mention that the Green Bay Packers are “owned by the people of Gre

The World's Most Gruesome Pants

Ransom Riggs

Only in Iceland would someone wear a dead guy as pants.

Secret Doors and Hidden Passageways

Jill Harness

I've always been fascinated with the concept of hidden rooms and secret passageways. That's why this article featuring 10 such architectural surprises was so fun to read.

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