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A circle is the set of points in a plane equidistant from a fixed point. That distance is called the radius. The perimeter of the circle is the circumference. The circle constant should be the ratio between these two. Using the diameter is one of the biggest blunders in the history of mathematics. You have to have extra definitions. You get the superfluous 2 floating around in all equations. It's sloppy.
A completely bogus concept can be very accurately modeled with math. Reality doesn't care.
Ah! But according to Landauer's principle, reality *DOES* care.
In many cases alcohol is involved. Particularly with the more unfortunate ones.
Considering that alcohol is used to disinfect the area to be inked, you're definitely right.
If I'm using books, it's because I don't want to stare at a screen before bed.
By obligation, I'm supposed to say "I use an e-reader, you insensitive clod", but I fail to see how my choice of reading method in any way influences your sensitivity or cloddiness (or lack thereof).