THE KNOWLEDGE FEED

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What Does Adrenaline Do?

Matt Soniak

Reader Noah wrote in with a question—"Why does the human body need

Brain Game: Math Square #37

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 (the red square).

Something New to Worry About: Vampire Bats

Ransom Riggs

Well, if you live in the Amazonian regions of Peru, it's something to worry about.

Morning Cups of Links: Annoying Office Jargon

Colin Patrick

One diligent Twitter user is attempting to create a highly-summarized version of the Bible. * Get in the mood for football with this countdown of the funniest touchdown dances of all time. * If yo

The Number of the Day: 16,000

Jason English

Mountains beneath Antarctica's ice sheets rise 16,000 feet. Related Link: Vacation to Mars: Photos of Antarctica's Dry Valleys, by Ransom Riggs [Source: National Geographic Answer Book

Our Back-to-School Sale Ends Tonight!

Mangesh & Jason

Act now and you can get 15% off the great stuff in the mental_floss store—t-shirts, mugs, books, a Periodic Table Shower Curtain, and more.

Weekend Links: Don't Hassle the Hoff

Allison Keene

My friend Jessica found a great link to a video lampooning the current net neutrality / Google hubbub by asking the question, what if "The Net" had been made in 2010 instead of 1995?

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: Wine Vending Machines

Allison Keene

Starting a fight in a bar is a dumb idea.

Lunchtime Quiz Leftovers

Jason English

The Late Movies: Best of the Worst Action Movie One-Liners

Ransom Riggs

There are a million great/horrible action movies out there, all of them chock-full of ridiculous one liners, most delivered either right before or right after the hero delivers a fatal blow.

The Quick 10: 10 Alfred Hitchcock Cameos

Stacy Conradt

It's Friday the 13th, so I hope all of you _flossers are keeping an eye out for black cats and ladders. Fittingly, it's also Alfred Hitchcock's birthday.

Video: Flame Thrower vs. Fire Extinguisher

Colin Patrick

Dancing Pigeons - Ritalin from Blink on Vimeo. MTV may not play them anymore, but don't say that music videos are dead.

Scuba Dog Digs Diving

Jill Harness

If you were a scuba diver and your dog got upset whenever you went on dives, what would you do?

A Salute to Southpaws for Left-Handers' Day

Jill Harness

Because the definition of left-handedness varies so much from study to study, it has been estimated that anywhere from 7 to 30 percent of the population is left handed.

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