THE KNOWLEDGE FEED

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Brain Game: Math Square #26

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. One of these numbers is already provided for you.

Morning Cup of Links: Slow-rolling Balls

Miss Cellania

The latest incident of how an online community can band together to help someone in the real world involves Metafilter members who kept two Russian girls from becoming sex slaves when they arrived in

Strange Geographies: The First Ghetto

Ransom Riggs

Venice is a city known for its stunning art masterpieces and its architectural marvels, for its famous canals, for being the birthplace of Vivaldi and a haven for classical music and opera lovers.

The Weekend Links: Sunday Edition

Allison Keene

I'm big on lists and schedules - I love crossing things off and find comfort in scheduling my tasks (I know, I know ...

Last Week's Most Popular Stories

Jason English

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

The Weekend Links: Saturday Edition

Allison Keene

Travel can be exhausting, but perhaps it would be less so if your luggage doubled as a seat ... * From Rachel (and a bunch of other people, though hers was the first I read), a site called Jim'

Lunchtime Quiz Leftovers

Jason English

The Late Movies: Comedians Before They Were Stars

Erica Palan

Everyone likes to see celebrities before they were famous, but comedians are a special breed.

The Quick 10: Pac-Man Turns 30!

Stacy Conradt

I spent a lot of time playing Ms. Pac Man and Frogger at Skateland when I was growing up.

5 Things You Didn't Know About Salmon Chase

Ethan Trex

Salmon P.

From a Distance: Visiting the mental_floss Store

Jason English

Yesterday Laura Drapac and Dave Koen paid a visit to the mental_floss retail store in Chesterland, Ohio. They made the trip from Denton, Texas.

What Words or Phrases Drive You Crazy?

Jason English

Every Friday, I post a series of unrelated questions meant to spark conversation in the comments. Answer one, answer all, respond to someone else's reply, whatever you want. Very casual.

Bart Simpson's Blackboard

Chris Higgins

In the opening credits of The Simpsons, Bart is usually (but not always) shown writing something on a blackboard at school, presumably a punishment for his schoolboy antics.

Secrets Between the Sexes

Jill Harness

Men and women are in a constant struggle to better understand the complex inner workings of one another's minds.

Amazing 3D Projections on Buildings

Ransom Riggs

This kind of blew me away. NuFormer is a company in the Netherlands that specializes in outdoor advertising of a very peculiar sort -- done on the faces of buildings.

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