Unsolved Mysteries of Proofreading

by Fred Schwarz

Here’s the sign that is posted by the incinerator chute in my apartment building:

The odd thing is that while you can find any number of typos in it, depending on how strict you are (five seems to be the irreducible minimum), whoever composed this message somehow managed to spell “naphthalene,” which is a normally a Championship Spelling Bee–level word, correctly.