Reddit mentions of The Blogger Abides: A Practical Guide to Writing Well and Not Starving

A Little History of Science, by William Bynum. (Link) It's a little newer than Bryson's A Short History of Nearly Everything, but on par with it in most respects. Covers the histories of medicine, astronomy, chemistry, the discovery of plate tectonics... pretty much all areas of science. Highly entertaining (particularly the section on anatomy and how early artists were painters by day and grave-robbers by night).

I also liked The Blogger Abides, by Chris Higgins (Link), which is an extremely practical guide to managing a freelance career. It's written for writers but is applicable to most freelance professions (photographers, consultants, etc.), and includes sections that most "be a writer" books wouldn't, like how to manage self-employment taxes and give pesky publicity people the brush without looking like an asshole.

For more traditional nonfic, I liked Deep State (link) about the government's secrecy industry; Agent Garbo (link), about a farmer who just decides to be a spy and ends up helping the Allies bring down the Nazis (it's insane); and literally anything written by Mary Roach -- even her tweets are great.