THE KNOWLEDGE FEED

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Brain Game: Math Square #59

Thanks for playing the Monday Math Square. The nine white squares inside the main red grid should be filled with the digits 1 through 9.

Now Waiting for the Bus Can Be Fun

Jill Harness

San Francisco has one of the finest public transit systems in America, but that doesn't mean the buses and subways are always on time.

Required Viewing: IBM's "They Were There"

Chris Higgins

It's hard to believe that IBM is 100 years old (well, nearly -- it turns 100 on June 16, 2011).

Morning Cup of Links: The Nazi-Mocking Dog

Colin Patrick

Editor's Note: Miss Cellania is taking a well-deserved week off. She'll return next Monday. In her absence, our good friend Colin Perkins will be guest hosting the Morning Cup of Links.

11 NFL Rules Named After People

Scott Allen

New rules in the National Football League, as in any sport, are often enacted in response to repeated on-the-field actions or bizarre incidents involving a specific player or coach.

Weekend Links: The Art of Shadows

Allison Keene

Movie sequels are generally schlocky, but there are exceptions (like The Dark Knight), and this Movie Sequel Map covers them all.

Last Week's Most Popular Stories

Jason English

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

Puppies Wearing Hats Eating Bacon Sharing Facts (about roller coasters)

Stacy Conradt

Here's a little-known fact about dogs: they love roller coasters. Just don't let them eat too much kibble before they

Lunchtime Quiz Leftovers

Jason English

Weekend Links: How the British Speak American

Allison Keene

From Richard, a really beautiful collection of lightning photography.

The Quick 10: Happy Birthday, MacGyver!

Stacy Conradt

Quick, someone rig a cake using some duct tape, bouillon cubes and spackle! That's right, it's McGyver's birthday on Sunday.

The Late Movies: Funny Babies

Miss Cellania

My family celebrated the arrival of our first granddaughter yesterday, so I couldn't resist picking out some of my favorite classic baby videos for the Late Movies.

Man Builds a Time Warp to the 1800s in His Basement

Colin Patrick

The basement in most homes is crammed with mountains of dusty old toys, clothes, holiday decorations and all other types of broken, forgotten or useless clutter. John Scapes decided to go another w

Portlandia Begins Tonight

Chris Higgins

Tonight, welcome to my world: Portlandia.

Screw This, Screw That: Why We Have Different Types of Screws

Matt Soniak

If you've ever mistakenly grabbed the Phillips head screwdriver when you needed a flat head, you've probably asked yourself why there are different types of screws. Let's start at the

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