This week we've got an awesome challenge from Dr. James Grime from Cambridge University, as seen on his stellar YouTube channel "singingbanana." In this challenge two people must avoid both being right at the same time successfully through 26 trials in a row. A feat that defies the 2000 to 1 odds against it! Your challenge: guess our system and then tweet Brian at @shwood BEFORE we reveal the answer. There's no communication between the two players, and no peeking of any kind. Our system works no matter how many trials there are, too!