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Does the "Hand in Warm Water" Trick Really Work?

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As the kids head off to summer camp, many of them will partake in the timeless tradition of trying to get their friends to pee themselves by slipping their hand into some warm water. Does this actually work, or have generations of campers wasted their efforts?

We can’t say for sure. There’s plenty of anecdotal evidence that suggests the prank works reliably, but, as they say, the plural of anecdote is not data. Some friend of a friend who swears this happened to him at camp decades ago doesn’t really count for much. To test things out in a controlled environment, the MythBusters once tried the trick on each other and a crew member in a lab with sleep-monitoring equipment and moisture alarms in the beds. Their results were less than impressive: zero wet beds (to be fair, though, a sample size of three isn’t great).

I’m not aware of any other scientific testing of the trick, and am not convinced that it does work, or that it doesn’t. It’s plausible, but light on evidence. 

If you’ll join me in the Speculation Zone, though, I’d hazard a guess that if the trick does work, it would rely on the power of suggestion. We’ve talked before about how having to pee when you hear the sound of running water is a kind of conditioned response, spurred by the unconscious connection we make between the sound and the act. I don’t think it's out of the question that a similar connection could be at work here, but it doesn’t seem as direct. Wet hands are associated with urination through hand washing, which you do after relieving yourself, and there don’t seem to be many issues with people losing control of their bladders other times they get their hands in some warm water. 

There is such a thing called “immersion diuresis,” which is urination brought on by temperature and pressure changes from immersing the body in water, but research suggests that whole limbs or the whole body needs to go under water for this mechanism to work, and a single hand isn’t enough. 

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Big Questions
What is Duck Sauce?
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A plate of Chinese takeout with egg rolls and duck sauce
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We know that our favorite Chinese takeout is not really authentically Chinese, but more of an Americanized series of menu options very loosely derived from overseas inspiration. (Chinese citizens probably wouldn’t recognize chop suey or orange-glazed chicken, and fortune cookies are of Japanese origin.) It would also be unusual for "real" Chinese meals to be accompanied by a generous amount of sauce packets.

Here in the U.S., these condiments are a staple of Chinese takeout. But one in particular—“duck sauce”—doesn’t really offer a lot of information about itself. What exactly is it that we’re pouring over our egg rolls?

Smithsonian.com conducted a sauce-related investigation and made an interesting discovery, particularly if you’re not prone to sampling Chinese takeout when traveling cross-country. On the East Coast, duck sauce is similar to sweet-and-sour sauce, only fruitier; in New England, it’s brown, chunky, and served on tables; and on the West Coast, it’s almost unheard of.

While the name can describe different sauces, associating it with duck probably stems from the fact that the popular Chinese dish Peking duck is typically served with a soybean-based sauce. When dishes began to be imported to the States, the Americanization of the food involved creating a sweeter alternative using apricots that was dubbed duck sauce. (In New England, using applesauce and molasses was more common.)

But why isn’t it easily found on the West Coast? Many sauce companies are based in New York and were in operation after Chinese food had already gained a foothold in California. Attempts to expand didn’t go well, and so Chinese food aficionados will experience slightly different tastes depending on their geography. But regardless of where they are, or whether they're using the condiment as a dipping sauce for their egg rolls or a dressing for their duck, diners can rest assured that no ducks were harmed in the making of their duck sauce.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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Big Questions
Can You Really Go Blind Staring at a Solar Eclipse?
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A total solar eclipse will cut a path of totality across the United States on August 21, and eclipse mania is gripping the country. Should the wide-eyed and unprotected hazard a peek at this rare phenomenon?

NASA doesn't advise it. The truth is, a quick glance at a solar eclipse won't leave you blind. But you're not doing your peepers any favors. As NASA explains, even when 99 percent of the sun's surface is covered, the 1 percent that sneaks out around the edges is enough to damage the rod and cone cells in your retinas. As this light and radiation flood into the eye, the retina becomes trapped in a sort of solar cooker that scorches its tissue. And because your retinas don't have any pain receptors, your eyes have no way of warning you to stop.

The good news for astronomy enthusiasts is that there are ways to safely view a solar eclipse. A pair of NASA-approved eclipse glasses will block the retina-frying rays, but sunglasses or any other kind of smoked lenses cannot. (The editors at MrEclipse.com, an eclipse watchers' fan site, put shades in the "eye suicide" category.) NASA also suggests watching the eclipse indirectly through a pinhole projector, or through binoculars or a telescope fitted with special solar filters.

While it's safe to take a quick, unfiltered peek at the sun in the brief totality of a total solar eclipse, doing so during the partial phases—when the Moon is not completely covering the Sun—is much riskier.

WOULDN'T IT BE EASIER TO JUST TELL YOUR KIDS THEY WILL GO BLIND?

NASA's website tackled this question. Their short answer: that could ruin their lives.

"A student who heeds warnings from teachers and other authorities not to view the eclipse because of the danger to vision, and learns later that other students did see it safely, may feel cheated out of the experience. Having now learned that the authority figure was wrong on one occasion, how is this student going to react when other health-related advice about drugs, alcohol, AIDS, or smoking is given[?]"

This story was originally published in 2012.

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