My nonfiction dose of the year

Two months, two Delany books. I don't think they're even among his most renowned works and I'm already becoming a fan. This little one was nominated for a Nebula award for best novella in 1965. He was 23 at the time. What the hell were you doing at 23?

3.5 but I don't really feel like rounding up to 4 Heinleins.