"Thanks go to Richard Stallman, without whose fine implementations [..], Calc would have been finished in two weeks." http://t.co/zI1rPd0m
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Did you know that M-x calc in Emacs supports exact fractions? (I didn't.) Use colons, so 1:3 is one third.
Emacs command of the day: quick-calc. Great for quick arithmetic from Emacs. With a prefix, inserts the result in the buffer too.
Emacs feature of the day: `M-x calc' supports a dizzying range of arithmetic with arbitrary precision, and keybindings like M-/ work too!