THE KNOWLEDGE FEED

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10 Excellent Bookstore Cats

Miss Cellania

Not all bookstores have cats: the big chains don't have cats, and some mom and pop stores keep their cats at home, so if you are allergic to cats, you can still find a place to browse for reading

Brain Game: Feel Like a Number

Put on your mathematical thinking cap and take the Tuesday Test Time challenge for today's mentalfloss.com Brain Game.

Morning Cup of Links: Osama+Zombie=Osombie

Miss Cellania

Nichelle Nichols talks about breaking barriers in television.

The Time We Found Pyramids on Mars

Calli Arcale

Image credit: NASA/JPL-Caltech Mars has long fascinated people. One of the few objects in the night sky to show a visible color and the only one that wandered, it was a natural draw.

"Simpsons" Creator Matt Groening's Dad Was Named Homer, and He Made Movies

Chris Higgins

Matt Groening created "The Simpsons," and as we all know, Homer Simpson is the patriarch of the family. Well, Homer was the name of Matt's dad too...but he wasn't a doofus.

Your Mom Is So Old the Babylonians Made Fun of Her

Colin Patrick

Some things are just purely human, it would appear.

This Snake Can Send You Back Through Puberty

Jill Harness

A lot of people are afraid of snakes and the fear makes total sense, even if most snake bites aren't lethal. As it turns out, they can actually send you back in time.

Feline Physics: Why Cats Can Survive Falls From Great Heights

Bill DeMain

Cat image via Shutterstock The other night, I watched a YouTube video featuring a woman standing on her bed, holding a cat upside down by its feet, then repeatedly dropping the cat onto the mattres

Don't Know Jack? Meet Howard Cogan!

David K. Israel

Chances are, if you live within radio frequency range of most any major city in the U.S. or Canada, you DO know Jack. But you probably don't know much about the man behind the voice of Jack...

Brain Game: Math Square #108

Monday Monday, so good to me... Enjoy a new Monday Math Square for today's mentalfloss.com Brain Game.

Morning Cup of Links: Five Fast Years

Miss Cellania

Nancy Brinker, founder of the Susan G.

Instant Replay: Live-Tweeting the Super Bowl

Jason English

Last month, Colin Perkins had the idea that we should live-tweet the Super Bowl, in the spirit of Pop Up Video.

Weekend Links: Legos In Space

Allison Keene

"In honor of Kristen Bell’s now infamous 31st birthday sloth meltdown, here are 31 pictures of sloths chillin’." This link is dedicated to my sloth-loving friend David E.

Last Week's Most Popular Stories

Jason English

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

The Upside-Down Illustrations of Peter Newell

David K. Israel

Peter Newell's work was very popular at the end of the 19th century, appearing in children's books like Topsys and Turvys, a collection of poems and images that can be viewed upside-down or

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