Mental Floss

BIG QUESTIONS





Edward Stojakovic, Flickr // CC BY 2.0

The polar vortex is famous for blasting arctic air south to the U.S. But what exactly is happening here?

Erin McCarthy


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Martin Luther King Jr. earned a doctorate in systematic theology from Boston University in 1955. In 1989, archivists working with The Martin Luther King Papers Project discovered that King’s dissertation suffered from what they called a “problematic use o

Matt Soniak




The All-Nite Images, Flickr // CC BY-SA 2.0

The furry sentinels ward off vermin. They also sleep in empty stock boxes. But are they a health hazard?

Jake Rossen








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Here's what goes into your favorite candy bars.

Michele Debczak






iStock

Fruitcake is a shelf-stable food unlike any other. So what is it that makes the holiday treat so freakishly hardy?

Shaunacy Ferro
Feeling sleepy? Don't be so quick to blame the tryptophan.

Why do people have such a hard time staying awake after Thanksgiving dinner? Most people blame tryptophan, but that's not really the main culprit.

Matt Soniak
iStock/MichaelSvoboda

Think of it as a big, wet, sloppy way of saying "I love you."

Natalie Zamora