Jeff Deck and Benjamin D. Herson, armed with their typo correction kit, traveled across the US to correct spelling and punctuation errors on public signage.

I stared at that no tresspassing sign, and I wondered: Could I be the one? What if I were to step forward and do something? The glare from the extra s seemed to mock me. Sure, others before me had recognized that there was a problem afoot in modern English. Plenty of people had made much hay of ridiculing spelling and grammatical errors on late-night shows and in humor books and on websites weighted with snark. But: Who among them had ever bothered with actual corrective action? So far as I knew, not a soul.

Read an excerpt of their book, The Great Typo Hunt: Two Friends Changing the World, One Correction at a Time.