I've been thin on Contra entries this month for a number of reasons, mostly because I've been putting the bulk of my creative energy into finishing "Drumlin Wheel." Nailed the first draft (after nine years!) about an hour ago. Originally scoped out at about 11,000 words (like "Drumlin Boiler") it ended up at 14,500. As always, when something major emerges from my subconscious I tend to hate it for a couple of weeks, after which I can fix what's wrong and like it again. More on this at some point.
While in Hawaii recently, we heard whale songs through a hydrophone that the tour boat crew had tossed into the water, and I immediately wanted one of my own. (We hope not to wait another five years to go back to Hawaii.) Here's an article on how to make your own hydrophone, which is nothing more than a waterproof mic on a (long) cable.