> Basically, we have three options for these kinds of words: “cooperate,” “co-operate,” and “coöperate.” Back when the magazine was just getting started, someone decided that the first misread and the second was ridiculous, and adopted the diaeresis as the most elegant solution with the broadest application. The diaeresis is the single thing that readers of the letter-writing variety complain about most.

Personally I use a diaeresis as well. Not very hard on an Apple device: press-and-hole "o", wait for the pop-up, press 2.

> This was in 1978. No one has had the nerve to raise the subject since.

If it ain't broke, don't fix it.