Emacs is absurdly featureful

Thinking of my recent entry about how our all being at home means more access to live presentations, recently I attended a talk (given from Britain) on Emacs, the text editor that is so much more that I even use it to read and send e-mail. From the presentation, we learned, among other things, that we can set up spreadsheets (well, tables in Org mode) where, given some algebraic expression in one cell, another cell's formula can be, the integral of that expression plus this quaternion. So, yet more directions in which the original editor has been extended, though perhaps not with features that were ever plead for by Excel's focus groups.