THE KNOWLEDGE FEED

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The Tallest Building in Kraków is "Szkieletor," He-Man's Nemesis

Chris Higgins

Photo circa 2008 courtesy of Joanna J., used by Creative Commons license. In 1975, construction began on a high-rise building in the center of Kraków, Poland.

Why is the Retirement Age 65?

Matt Soniak

In the early 1880s, Chancellor Otto Von Bismarck of Germany had a problem. Marxist unrest was spreading across Europe and some of his own countrymen were calling for socialist reforms.

Brain Game: Math Square #127

Today's Monday Math Square mentalfloss.com Brain Game challenge is the first of the summer.

Morning Cup of Links: Walk Your Human

Miss Cellania

NASA's Mars probe Curiosity is scheduled to land on the red planet on August 6th.

World War I Centennial: With Friends Like These...

Erik Sass

Installment #23: In the 19th century, European statesmen came to share an amoral (some would say cynical) view of geopolitics, in which international relations were based solely on the size and streng

The Earliest LOLCats and Other 19th-Century Animal Photography

Jill Harness

LOLcats and other funny animal pics weren't born with the Internet; they've been around since the end of the 19th century. Here are some of the early photographs that inspired

Weekend Links: The Statue of Liberty in Paris

Allison Keene

Most of the United States has been in a devastating heat wave this week (also I've been watching the Euros taking place in Poland and Ukraine and it seems there are very high temperatures there n

This Sand Hates Water!

Chris Higgins

If you take regular sand and expose it to trimethylsilanol vapor (ahem, (CH3)3SiOH for the chemists in the crowd), the sand becomes hydrophobic -- literally meaning "water-fearing." The res

6 Summer Camps for Exceedingly Wealthy Children

Rob Lammle

For many, summer camp means a week sleeping in a cabin that doubles as a sweat lodge, spider-infested communal showers, and swimming in a scummy pond.

Last Week's Most Popular Stories

Jason English

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

Who Invented the Knuckleball?

Scott Allen

RAY STUBBLEBINE/Reuters/Landov New York Mets pitcher R.A.

Íslendingabók: How Icelanders Avoid Incest and Find Celebrity Relatives

Jill Harness

Living in a small, mostly static population creates some uncomfortable issues.

"Rainbow Connection," 33 Years Later

Chris Higgins

33 years ago yesterday, The Muppet Movie made its silver screen debut.

Weekend Links: The Technicolor Dream Whale

Allison Keene

I think the title of this says it all: "Holy crap, this whale spouts rainbows." * From James, "I realize this is an ad for Coca Cola, but I still liked the video clips." James,

11 Authors Who Hated the Movie Versions of Their Books

Stacy Conradt

Some of the most beloved movies ever were based on books. But just because we loved them doesn’t mean the original author

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