Clocklus - Mathematically Timing
The deceptively cool looking Clockus is one heavy-duty brain-drain that takes off from where the IQ Clock left us. It presents you with a rudimentary math problem every hour so if you want the time, brush up on your addition, subtraction and multiplication tables. For you math geniuses, Clockus can serve up questions in the 24hr format. Oooh double digits!