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Where I went to grad school in computer graphics (didn't finish, by the way), PhD students were required to take a class to hone their writing skills.
Your post also reminds me of a fairly famous physics professor I had as an undergrad. He couldn't explain things well at all. I remember early in the course when he tried to draw the axes - the standard x-y-z diagram you see in every science or math class where the Cartesian coordinate system gets used - and he just couldn't get the z axis right (though he spent quite a bit of time erasing and redrawing). Which is okay - not everyone has to be a whiz at drawing a 2D representation of something 3D - but impelled me to skip the rest of the classes that semester and just read the (well-written) book instead.
Your post also reminds me of a fairly famous physics professor I had as an undergrad. He couldn't explain things well at all. I remember early in the course when he tried to draw the axes - the standard x-y-z diagram you see in every science or math class where the Cartesian coordinate system gets used - and he just couldn't get the z axis right (though he spent quite a bit of time erasing and redrawing). Which is okay - not everyone has to be a whiz at drawing a 2D representation of something 3D - but impelled me to skip the rest of the classes that semester and just read the (well-written) book instead.