I took "Earth Science" in 8th grade. No, we got into NO math at all, but we did learn that electricity can kill you, that batteries contain stored electricity, that many if not most metals conduct electricity, and that "playing" with batteries was a really dumb and bad idea. Surely it's not that far of a jump to figure out that putting batteries loose in a pocket filled with change, keys, etc, is another dumb and bad idea?
Andria
But they never taught you to lick a 9V battery to test whether it was still good? Geez, curriculums those days left out all the important stuff! ;-)
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I know a lot of people who are afraid to touch the terminals of the lead-acid battery in their car, because they don't want to get a shock. And if the battery got rained on, they're in a total panic, because "Electricity and water don't mix". And people here who seem to believe that dual coil setups need to be exactly the same resistance because "electricity follows the path of least resistance"
Look, battery cells with the energy densities we have today were unheard of as recently as 10 years ago, never mind the last time any of us were in school. It's
not intuitive, there's
no practical experience that any of us can rely on. Throw a duracel AA battery from your pocket into your change jar? No problem. (Not that good for the battery, but it just dies, without fanfare).
People get surprised all the time when their laptops or cellphones catch on fire, not because they're stupid, not because they're uneducated, and not because they're ignorant or like taking risks. Nobody knows everything, (particularly since "everything" is constantly changing). My wife would probably disagree, since she often accuses me (Quite accurately, IMHO) of being a "know-it-all".