Sapyx ✭✭✭✭✭

A "roll", for practical purposes, needs to come up to a full dollar amount if possible, provided that doing so was not too unweildy. Thus, you'd need 50 2 cent pieces to make a $1 roll. Her… (View Post)

The denomination is usually spelled "tetrobol", and the city is usually spelled "Byzantion" or Romanized to "Byzantium" - the city which would eventually become re-made … (View Post)

Even in a country like the US where "finders keepers" is the general rule for finding lost treasure, there are recognized exceptions. You can't go digging around a Civil War battlefield or … (View Post)

When copper oxidizes, two compounds can form: copper(II) oxide CuO, which is black. And copper(I) oxide Cu2O, which is red. Under "normal" conditions of a coin in circulation you typically … (View Post)

The rainbow colours seen on oil slicks, soap bubbles and on your mylar coin holders are caused by the thin film effect, and can be generated whenever you have a "thin film" of something sit… (View Post)