I think that Homestar Runner did a great short[1] about this for their 25th anniversary.
125 karma · joined July 18, 2015
Side note, as someone who works adjacent to the RF and electronics industry, getting my Ham license was the best thing I could have done to help my CS brain understand the radio and electronics side of what we do. If you’ve ever been curious about getting your license, I highly recommend it!
[1] http://www.ioba.org/pages/resources/condition-definitions/
Almost every time I buy a book listed as "Very Good" which has a clear definition on AbeBooks' website[1], I end up getting something with clear markings, or damage.
[1] https://www.abebooks.com/books/rarebooks/collecting-guide/un...