In science fiction, subgenres often give birth to other subgenres. Solarpunk, for instance, begat lunarpunk. It’s also how we got dieselpunk out of steampunk. But what exactly is dieselpunk? That’s one of many questions I put to Danielle Ackley-McPhail and John L. French, co-editors of the new short story anthology Grease Monkeys: The Heart And Soul Of Dieselpunk (paperback, Kindle), in the following email interview.