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6 Angry Letters Kids Sent Neil deGrasse Tyson About Pluto

Lucas Reilly

When Pluto was demoted, elementary school students flipped out.

Why Can You Only Travel With 3.4 Ounces of Liquids?

Matt Soniak

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: 408 Hot Air Balloons

Roma Panganiban

The World's Most Amazing Staircases

Jill Harness

They say life isn't about the destination, but the journey—and that also seems to be true about these amazing staircases.

Morning Cup of Links: Ultra-Dedicated Zookeepers

Miss Cellania

Would You Eat At One of These Totally Bizarre Restaurants?

Jill Harness

One Second in Every Nation

Chris Higgins

Weekend Links: The Speediest Spaceships

Roma Panganiban

The Late Movies: Songs About Prison

Erica Palan

Fact Contest! Amazing Facts About Near Misses

21 Fun Activities Outside the San Diego Comic Con

Jill Harness

Pain is Beauty: 10 Bizarre Facial Treatments

Amanda Green

You look fantastic. What's your possibly horrifying secret?

The Missing Links: The Story of the Soaker

Colin Patrick