What Is Something You Learned Here That Blew Your Mind.

This XRF?

"XRF (X-ray fluorescence) is a non-destructive analytical technique used to determine the elemental composition of materials. XRF analyzers determine the chemistry of a sample by measuring the fluorescent (or secondary) X-ray emitted from a sample when it is excited by a primary X-ray source."

https://www.thermofisher.com/us/en/...hnology.html

Mind blown by...

o What an absolute SCIENCE some folks have made of coin photography. Just amazing.
o How deep US paper money collecting can go.
o How much there is to learn about this hobby and what a valuable resource CCF is to help with that!
o How many fly-by new members there are asking if a beat up 1984 U.S. cent is retirement money. Then they disappear. I guess this really don't blow my mind.

The sheer scale of CRHing still blows my mind. Also, the things that people put into coin rolls is amazing.

In addition to the Princely States, I should perhaps add that there are many countries and historical entities that I had no idea even existed until I started finding their coins. Guernsey, Jersey, New Hebrides, Niue, Cook Islands etc etc.... never even learned about them in high school or college history!