OK, so its official name is the "Pop Quiz Clock", but that makes it sound like it's a chore. You don't even really need to be an arithmetic whiz to use it, assuming you are familiar with the layout of non-digital clocks. I like it for it's "I love math" sensibility. Unfortunately, there's no price or purchase information on the web site, so I don't know how you would actually acquire one for yourself.
And, yes, I know that the equation for "9" actually comes out to 9.005 (when rounding off, anyway). I figure it's within the margin of error for the second hand, so close enough.
(Via Nerd Approved, who for some reason appears to think the clock involves calculus)
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