Here's how this works:

• Anyone can submit a free response option in the form of a guess that they have about me. It can be about anything - guesses about my music taste, my research interests, my sleep habits, etc.

• If I don't want to answer the question, I'll resolve the option to N/A. (I'm generally pretty open about stuff.)

• Otherwise, I'll resolve to YES if the guess was right, NO if the guess was wrong, and to PROB if it was partly right and partly wrong.

• Between the option being submitted and me actually seeing and resolving it, you (and other traders) can spend mana to try to make a profit. If you're confident in a guess, buy YES - if you think someone has it wrong, buy NO. I won't bet on the options before resolving then.

• I will generally wait for several people to trade in an option before resolving it.

• This continues indefinitely, because the market doesn't close when I resolve an individual option.

Have at it!

Thanks to @firstuserhere for this market idea. You can find their original market here.