Long day today, so I just did the Day 1 Self-Study section. It looks like the official mailing list is livelier than both the iolanguage subreddit and StackOverflow.
0 and "" evaluate to true, nil evaluates to false.
= assigns to a slot or raises an error of none exists := assigns to a slot and creates one if none exists ::= assigns to a slot and creates one if none exists and creates a setter method for that slot
Finally, _why had some things to say about Io, and even used it to write a little web framework called yown. Now you know.