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...
And every ten-dollar roll of quarters or halves would have been most of a day's wages. The average man's salary in 1955 was $3400 a year. That...
Absolute nonsense. [ATTACH] Or, to put it a bit more charitably: You're free to pick any one commodity and say "this is the measure of value"....
Ah, right. I misread the listings.
He may not be able to hear you if you type that quietly. ;)
Now, I have seen -- and bought! -- "too-good-to-be-true" eBay listings. Sometimes they were fraudulent. Other times, they weren't; they were just...
Um, yes, that's how Guess The Grade threads usually work...? That's not how Guess The Grade threads work. If you're not interested in the series,...
I'm not in a position to check eBay at the moment, but I'd be really nervous about a seller offering a large number of ASEs that close to melt....
That looks like some impressive strike doubling to me, but not a doubled die, so not the variety you're looking for. I don't see notching on the E...
@SSG_Gonzo posted a raw proof 1942-P Jefferson (silver). @RonSanderson posted another. You replied with Do you see the source of my confusion?
Separate names with a comma.
