At which position, in an e-mail similar to the following one, is it correct to write a "Post Script"? Position I or Position II? Dear Professor X. Hello, I am John Smith. Email Body... ​Sincerely yours, ​ John Smith (Position I) VLSI Design Lab Department of Computer Engineering X Univers...

Are there significant differences between satire and parody? Can you provide examples of the difference? Do you know of a book which is considered satire; one which is considered parody?

Ideally anything more substantive than 'participant'. I wasn't able to find anything using Google search or Word's synonym tool, and I'm looking for a more personable alternative to using the term 'opt-in' as a noun referring to people.