Photoshop for the Scientist

I've been working in research labs for the past 10 years and, like most people, I made extensive use of PowerPoint for building my figures and when I did use Photoshop, I wasted a lot of time doing things manually or destructively (even though I thought I was a pro at the time!). Then a couple of years ago I got a job analyzing histology and microscopy images in Photoshop and realized how little I knew. I couldn't believe some of the tools that were available; tools that I would never have discovered otherwise. Since then, I've spent literally hundreds of hours working through tutorials, completing mastery-level courses on Lynda.com and experimenting and analyzing my own data. I'd now like to share what I've learned, and hopefully save you the hours and headaches I spent figuring all this stuff out by trial and error!