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When you feel one degree or level worse than being numb.
Most puns make me numb, but math puns make me feel number.
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An eye chart for math geeks, with the digits of the number Ï and some math symbols on display rather than showing any of the 26 letters of the English alphabet and the ten numerals.
Doctors at some elite colleges are giving students who come for their medical check-up the option to choose between a pi chart and the eye chart that is commonly used in spectacles shops and hospitals.