Open Thread June 2010, Part 3

This thread is for the dis­cus­sion of Less Wrong top­ics that have not ap­peared in re­cent posts. If a dis­cus­sion gets un­wieldy, cel­e­brate by turn­ing it into a top-level post.

The thrilling con­clu­sion of what is likely to be an in­ac­cu­rately named tril­ogy of June Open Threads.