Eating a spoonful of sugar will cure your hiccups. Picking up a toad will give you warts. These little dubious tips are commonly called old wives' tales -- you usually hear them from your superstitious grandparents, and they're usually bullshit.
Usually, but not always. Some of these folk cures and bizarre warnings have stuck around for a reason, and it just took science a while to catch up ...
5Yes, Peanut Butter Gets Gum Out of Hair
So you were chewing gum and for whatever reason decided to store it for later by sticking it onto your scalp. We have no idea why techniques for getting gum out of hair became necessary, let alone popular, seeing as there are very few reasons why gum should ever come into the vicinity of the top of your head (maybe you were aiming for your mouth and missed?). Regardless, there are plenty of folk remedies that claim to hold the solution to this apparently age-old problem, and one of the most popular is to shampoo your gummed-up head with peanut butter -- the offending wad will wash right out.
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For those who doubted that good grooming and kinky food fetish play could go together, there's your proof.
Honestly, it sounds like a prank. Wasn't there a whole Simpsons subplot about this going disastrously wrong?
It seems like such a nonsense answer because, well, gum is sticky, and peanut butter is sticky, so how would this not just create a bigger, stickier mess? And one that makes it look like somebody took a shit on your head? The secret, though, is the oil.
Michael Saechang, via Wikipedia
Meaning if there's no PB&J around, you could probably improvise.
Basically, the reason gum doesn't come out with a quick shower is that it's a hydrophobic substance -- it doesn't dissolve in water. Try to wash that shit out and it will only stick harder, like an alien facehugger poked with a scalpel. But it does dissolve in oil, and peanut butter is full of it.
"Wait, doesn't that mean I could use cooking oil or some shit instead?" Sure, and you can browse YouTube and watch thousands of videos of people using olive oil -- it seems to work fine. People always cite peanut butter either because it's easier to work with (as opposed to leaning over the sink and dumping half a bottle of canola oil on your head) or because it makes a more interesting "fun fact" since it's so unexpected. Hell, that's why we did it.
4Old People Can in Fact Predict the Weather
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You've probably heard an old person say they know it's going to rain because they "feel it in their bones." You probably also dismissed that codger because you know that old people don't have some kind of magical divining rod lodged in their skeleton that can predict the future better than the folks on the Weather Channel. Still, the idea that the elderly have a sixth sense about this kind of thing has been around as long as the weather has.
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"Grab your coats, kids; Grandma's got that distant, rueful look again."
You should have a little more respect for your elders, because science has discovered that old people really do have magic weather-predicting powers. And by that we mean arthritis. When a storm begins to form, it's preceded by a drop in air pressure. The leading theory about how elderly people are able to detect this drop in pressure is that it wreaks all kinds of havoc on the fluid in their joints, making their already tortured limbs swell up and throb like the dickens.
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"This isn't the 'swell up and throb' you promised me, Pfizer."
One way of thinking about it is that your body is like a balloon, and it keeps its shape because the pressure on the inside is the same as that on the outside. When the outside pressure drops, the balloon expands -- and so does your body. If you have arthritic joints, like the decrepit skeletons of many septuagenarians, this translates into aches and pains that generations of the elderly have come to associate with an upcoming change in the weather (note: low air pressure = rain).
And it's not just your joints -- science has also figured out that headaches can be brought on by the electromagnetic disturbance caused by an approaching storm. Researchers found that headache and migraine sufferers had a 31 percent increase in brain pain whenever lightning struck within 25 miles. They probably don't sense it in time for you to dodge out of the way or anything, but still, it's pretty weird.