Usually, the answer for the previous day's riddle is posted on the cueernt day. That sometimes doens't happen for Friday. That one usually gets posted on Monday, due to different set of riddle posters. Play along with us everyday, we will help you out.
And Barrett, she is usually the first one in with the correct answer every day, so she will really be able to help.
If Google doesn't have the answer, you can Ask Jeeves.