FlyingAl ✭✭✭✭✭

Ah, to see where we've all come from... From this: . . . To this: (View Post)

Very interesting. I wonder if the TPGs XRF each of the coins that come in for error attribution. (View Post)

We had a fun chemistry lab today, and it got me thinking. We took some cents and electroplated them in a solution of zinc and hydrochloric acid (the supplies for which could be bought rather cheaply)… (View Post)

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I forgot one more statistic, which was really dumb of me because it's rather important. Standard deviation between grades assigned by the graders were: Images: 2.751 PCGS contest: 4.523 NGC cont… (View Post)