Mental Floss

BIG QUESTIONS

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

Sledding image via Shutterstock“Put a jacket on if you’re going out there, or you’ll catch a cold.”It’s a common refrain of grandmothers all over the world. Are they right, though? Do low temperatures have anything to do with catching the common cold? Mos

Matt Soniak


The Duke of Windsor marries Wallis Simpson in 1937.

In the 1930s, how would a middle-class Baltimore divorcee become romantically involved with the man who would be King of England? It always comes down to who you know. And Wallis Simpson knew how to climb the social ladder very effectively.

Kathy Benjamin


vchal/iStock via Getty Images

I know I’m only about a decade late, but I recently, finally, watched the entire run of The Sopranos. Tony and his crew get their hands into plenty of different moneymaking schemes, but throughout the series one character or another (Tony, Richie Aprile,

Matt Soniak


Smelling image via ShutterstockI’m perfectly suited to answer the Big Question that reader Katie posed the other day, because I have anosmia, which means I can’t smell. At all. Every diaper my two-year-old has ever filled has been totally odorless to me.

Stacy Conradt


Image credit: NASALet's start with the bad news: Remember that hole in the ozone layer that scientists discovered over the Antarctic in 1985? The one we worried would give us all skin cancer and cataracts with its unshielded bursts of UV rays? It’s still

Ethan Trex
tuu Sitthikorn/iStock via Getty Images

The hose that attaches the nozzle to the gas pump is designed to break into two pieces when a certain amount of force is applied to it. Next time you’re at the gas station, check the hose for a metal coupling.

Matt Soniak

Quicksand is a staple hazard of adventure movies, TV shows and video games. Whenever a minor character needs to be killed off quickly, the hero needs someone to rescue, or danger needs to be introduced without calling the villain in, quicksand is there to

Matt Soniak
Vonschonertagen/iStock via Getty Images

Paper cut image via ShutterstockThere are a couple things at play here, some involving the paper, some involving your skin. For one thing, what part of your body comes in contact with paper the most?

Matt Soniak




istock.com/ByronOrtizA

Some animals have it made. Their whole day revolves around eating and having sex (and, to be fair, trying not to get eaten themselves). And when winter arrives, they get to curl up somewhere and wait things out until the weather is nice again. Can humans

Matt Soniak


inga/iStock via Getty Images

Trauma, that’s what. It’s the smell of chemical defenses and first aid. The fresh, “green” scent of a just-mowed lawn is the lawn trying to save itself from the injury you just inflicted.

Matt Soniak


Adam's apple photo via ShutterstockTouch your fingers to the front of your throat and start humming. Feel around until you can feel vibration directly under your fingers. That’s your larynx, or voice box. It houses your vocal cords and is involved in brea

Matt Soniak
istock.com/st_lux

The legal pad got its start in 1888, and it's still a best-seller at office supply stores. But why exactly did that yellow tint become popular?

Matt Soniak


istock.com/eldadcarin

Did the Nazis Have a Secret Antarctic Fortress? Like many conspiracy theories, there are some elements of truth to it all. But whether the facts can be woven together into one cohesive narrative without having to make great leaps of logic is another matte

Matt Soniak


istock.com/mrod

The Gideon Bible is not some special version or translation of the Bible that hotels really like (the books are usually plain old King James Versions); they're named for the group that distributes them.

Matt Soniak




iStock / MirasWonderland

Chocolate is toxic to dogs and a number of other animals because it contains alkaloid chemicals called methylxanthines - namely, theobromine (3,7-dimethylxanthine) and caffeine (1,3,7-trimethylxanthine).

Matt Soniak
istock.com/RonBailey

Point-blank is the range at which a given weapon/ammunition combination can be fired at the center or vital area of a given target and hit it without the shooter having to adjust the elevation of the weapon to account for the effect of gravity on the proj

Matt Soniak