Large Bandwidth Collider

…as you create a Smart Folder (ie do the Finder Spotlight search) hold down the alt key. This will turn the plus icon into a … icon, allowing you to add multiple conditions.

Wondered how to do this forever and never got around to looking it up. Then I wanted to make a search in the Finder sidebar that’d show me all of my ebooks (ePub and mobi) and that required me to figure it out.