This, sirs, is why LaTeX asks you to differentiate between sentence-ending periods and non-sentence-ending periods in source code, and adds just a little bit of

This, sirs, is why LaTeX asks you to differentiate between sentence-ending periods and non-sentence-ending periods in source code, and adds just a little bit of elasticity to the sentence-ending periods during compilation. The tools that make things beautiful know how to make things beautiful. The rest of the time, there's: (setq sentence-end-double-space nil)