THE KNOWLEDGE FEED

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Brain Game: Math Square #85

The mentalfloss.com Brain Game is back to kick off this week with a new Monday Math Square. Enjoy! The nine white squares inside the main red grid should be filled with the digits 1 through 9.

Morning Cup of Links: News by Typewriter

Miss Cellania

Journalism students at Florida Atlantic University recently constructed their special final summer issue of the student newspaper.

Mata Hari: Famous Spy or Creative Storyteller?

Stacy Conradt

Nearly everyone has heard of Mata Hari, one of the most cunning and seductive spies of all-time. Except that statement isn't entirely true. Cunning and seductive, yes. Spy?

Last Week's Most Popular Stories

Jason English

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

Weekend Links: Around The World in One Minute

Allison Keene

Forget going around the world in 80 days, try one minute. The editing of this clip is so fantastic. Makes me want to hop on a plane!

Two Rules Named After Deion Sanders

Ethan Trex

Today Deion Sanders is being inducted into the Pro Football Hall of Fame. But even if the legendary cornerback weren't enshrined in Canton, history would remember Neon Deion.

The World Wide Web Turns 20

Jason English

Weekend Links: Unbeatable Beets

Allison Keene

Probably the most delicious thing I've seen all week. Not craving beets? Didn't think you even liked beets? You may well change your tune after this lovely recipe video.

How the Rainbow Became Associated with Gay Rights

Stacy Conradt

The first time Roy G. Biv flew in the name of LGBT rights was on June 25, 1978, in the San Francisco Gay Freedom Day Parade.

The Late Movies: I Love Lucy

Miss Cellania

Saturday, August 6th is the 100th anniversary of the birth of Lucille Désirée Ball. Lucy made many movies and TV shows, but will always be best known for the 1951-1957 TV series I Love Lucy.

At the Libraries: Horrendous Book Covers from the '80s

Miss Kathleen

Time for another week of book- and library-related fun!

10 More Trademarked Words

Lauren Harrell

After we published our list of 25 Brand Names People Incorrectly Use as Generic Terms, our wonderful readers responded with a host of other trademarked words and brand names that often get used as nou

Phrase Origins: The Real McCoy and On The Wagon

David K. Israel

We use these hackneyed expressions all the time (hence the hackneyed element), but where do they come from?

What Were Your Baby Teeth Worth?

Jason English

On Fridays, 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.

We Love Lucy! Secrets From Your Favorite Episodes for Lucille Ball's 100th Birthday

Kara Kovalchik

Leonard McCombe/TIME & LIFE Pictures Tomorrow would have been Lucille Ball’s 100th birthday.

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