$1000 royalties!

I’ve finally earned $1000 in royalties on my textbook!  Thank you to all my purchasers—especially those who chose to pay more than the required minimum.

Incidentally, the royalties come to a little more than the expenses I’ve incurred in developing the labs for the book, but it’s a good thing that I have a salary and could use sabbatical time to write the book, as the royalties come to less than 50¢ an hour of writing (probably more like 20¢ an hour, once expenses are taken into account).