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1. brandie
   January 7th, 2008 at 11:31 pm

   Love it. Obviously you don’t need to know the math behind it to figure out what time it is, but it’s a cute exercise to work it all out.

2. Sid Morrison
   January 8th, 2008 at 4:04 pm

   Math “whiz”? Yeah, figuring out the square root of 9 is pretty challenging.

   I’d say it’s geeky and suitable for a math teacher’s classroom, but not quite “whiz level”. It’s probably beyond about the top 5% of U.S. government school teenagers, though. Cute.

3. Allen
   January 8th, 2008 at 6:34 pm

   Why do you need Wikipedia to tell you that .999(9) is equal to 1? The proof is three lines long:

   Let S = 0.999(9)
   Then 10*S = 9.999(9)
   10*S - S = 9 –> 9S = 9 –> S = 1

   Tada.

4. ted
   January 8th, 2008 at 8:50 pm

   Some of those are just needlessly complicated. The square root of nine plus nine minus nine? Come on. That’s not clean at all.

5. Antique clocks
   February 10th, 2008 at 11:10 pm

   It’s pretty amazing! Nice clock for math whizzes. I like it!

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