As a teacher, it is likely that you will have to put together some sort of slideshow at some point in your career. Sure there are lots of pieces of software that will create great slideshows for you (iPhoto, etc.). But what if you have a bunch of photos on your drive somewhere and 20 seconds to make a slideshow? You could use Keynote. Here is how.
Step 1: Select photos in Finder
Step 2: Create a new Keynote document
Click here if you don’t remember how.
Step 3: Drag your photos on Keynote’s sidebar
Step 4: Set your transition time
Step 5: There is no step 5. Press ‘Play’, you’re done!