Fact: if you have *n* readers check you work for typos, the *n+1* reader will find a previously undiscovered typo with 42/*n* seconds of looking at the work.

Fact: If you open your book and successfully fix a typo, you will introduce *(6.5x-y)/3* new typos, where *x* is the number of keystrokes used to fix the typo and *y* is the number of pages in the chapter.

Further research is needed to verify the constants across multiple writers. This may all just be me.