Mental Floss

BIG QUESTIONS

Image credit: Daniel R. Tobias/Wikimedia CommonsI was working at Tower Records back in the late 1980s, when the compact disc started replacing the vinyl LP. Beyond the arguments over the analog vs. digital sound (which continue to this day) and the higher

Bill DeMain

It is now a deadly weapon in Mario Kart and a slapstick comedy staple, but how did the banana peel gets its reputation as such a threatening object?A Danger to SocietyBefore the discovery of its comedic potential, the banana skin was considered a real pub

Laura Turner Garrison


Getty Images

In south London, at the Royal Observatory, Greenwich, it’s possible to walk up to a metal strip running along the ground in a courtyard and, stepping over it with one foot, straddle the world. Suddenly, one half of your body is in the Western Hemisphere a

Matt Soniak


Image credit: StockbyteWhen a bug flies into a spider web, the game is over. It’s almost instantly stuck, and a sitting duck for the web’s owner. When you or I walk into a web, we’re a little better off than the bug because we won’t be dinner, but the sti

Matt Soniak


istock.com/setsukon

Picture an atom. Now picture that atom getting excited. Maybe its birthday is coming up. Anyway, when an atom or a molecule gets excited, its electrons' energy levels go up. When the electrons fall back down to their normal state, they release energy in t

Matt Soniak


istock.com/nightman1965

The characteristic green tint is by design, for a few reasons. First, device makers have experimented with a few different colors and found that the different shades that make up the monochrome night vision image are most accurately perceived and distingu

Matt Soniak
istock.com/a-poselenov

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. To take the wind out of their sails and stave off more radical policie

Matt Soniak






If you’re a member of my generation or the one that raised it, your house was probably full of all sorts of glow-in-the-dark stuff in the 80s and 90s. Yo-yo's, stickers, action figures, clothing, you name it. As a kid, I thought it was just short of magic

Matt Soniak


Jason's Phone

Let’s picture a typical moment in my day: I’m minding my own business, with my iPhone in my back pocket. Suddenly, my left cheek is shaking as the phone vibrates and does the bzzt, bzzt, bzzt-ing dance of its people on my backside. I check the phone, and

Matt Soniak
istock.com/rzelich

The very first traffic light, installed outside the Houses of Parliament in London in December 1868, had red and green gas lamps for nighttime use. The device was pretty crude, and less than a month after it went operational, it exploded and killed the un

Matt Soniak

( )Parentheses (the single one is called a parenthesis), also known as curved brackets, have plenty of uses in everyday written language. Their most common use, as I’ve demonstrated already, is segregating subordinate material or asides. Usually, this is

Matt Soniak


Eric Huang, Flickr // CC BY-NC-ND 2.0

Some Dum Dums have wrappers with question marks where the flavor is normally printed. This was a marketing idea that made the production process run more smoothly and made eating Dum Dums more fun.

Sandy and Kara




Truman isn’t just gleeful in that famous photo because he won the election, but because it was egg on the face of a paper he hated, the Chicago Tribune. The paper had a conservative bent, disapproved of most of his policies, and had once even called him a

Kathy Benjamin


istock.com/LauriPatterson

The sugars in beans are far too big to slip though the intestinal wall on their own, and our guts’ enzymatic tool kit doesn’t have the right stuff to break the big things apart into more manageable pieces.

Matt Soniak
iStock/milla1974

Well, they're not dyed for St. Patrick’s Day. These are just from potatoes in which chlorophyll had started to form. This can happen when potatoes, which grow underground, are exposed to too much light in the field or factory, in storage, on the store she

Matt Soniak

LOUIS LANZANO/Landov The short answer: no.The long answer: Once upon a time, being presented with the key to the city served a real function. In ancient times, when it was common for European towns to be ringed by walls, visiting dignitaries were presente

Stacy Conradt
istock.com/SPmemory

While the lifespan of any individual atom is random and unpredictable, the probability of decay is constant. You can’t predict when an unstable atom will break down, but if you have a group of them, you can predict how long it will take.

Matt Soniak