Mental Floss

BIG QUESTIONS

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


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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


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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




You hear the term all the time, but is there really anything special about grand juries? Not on the surface. Like a regular trial jury, a grand jury is selected and sworn in by a court, and are often, in fact, pulled from the same pool of people as trial

Matt Soniak




Goldfinch4ever/iStock via Getty Images

So I'm up in Seattle this week, staying at a hotel some blocks from the original Starbucks (which, it turns out, isn't REALLY the original, but rather the second location, which was situated better for marketing purposes, but who's counting).

David K. Israel