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> Optimal readability is attained with 60-70 characters. This is due to human psychology

Actually this claim is disputed: http://psychology.wichita.edu/surl/usabilitynews/72/LineLeng...

Interesting. It might be that reading from screen works differently than from paper, where the 60-70 limit is a tradition. However, reading news is very different from reading code, so it doesn't go without saying that this result can be generalized to code.

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