Took me more toward Gilbert and Sullivan. "This US Quarter celebrates the Semiquincentennial Another in a stream of mediocrities perennial..."
You'll have an easier time getting mercury than carbon tetrachloride at this point. They're both toxic and persistent in the environment, but...
I'm surprised all the 90% halves are lumped together; I guess the weight the Barbers have lost due to circulation is offset by numismatic premium....
(Googles book) Well, it looks like I'll bloody well have to now.
Here's one, maybe: https://www.sciencedirect.com/science/article/pii/S1658365514000880 So, it breaks down under heat, light, or mechanical...
I have an old UNESCO "700 Science Experiments for Everyone" book that shows buoyancy with liquids available in any classroom -- mercury, carbon...
Salt water is denser than tap water. Some things will sink in both, some things will float on both, and some things will sink through tap water...
Oddly enough, to get a good blue color in fireworks, you need copper and chlorine. Thanks for sending me down a pyrotechnic Googling rabbit...
I like this idea, but some quick Googling indicates that both plastics have the same density (1.38g/cc). A bit more digging turns up this table...
I expect PVC plastic would break eventually, too; it would just take more repetitions. I've had the non-PVC flips crack the first time I folded them.
I saw this headline and thought for a moment that someone had received an ASE in change...
Going on sale early November, forget the exact date.
Not all plastics are the same. Different polymers degrade differently -- just look at PVC vs. non-PVC coin flips. There's also increasing concern...
Since you're looking for something that won't deteriorate over time, maybe they should tuck them inside a McDonald's hamburger. Or a Twinkie.
I applaud your discipline. I think I'd find it really hard to let go of that one once I had it in hand...
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