Ever been working on something on the computer, know you saved it, then can't find it?

Maybe I'm dense and the last person to realize this, but if you go into the Explorer function (Windows Explorer for you PC types; despite those snarky Apple commercials about how Apple products are *so* *much* *better* [yeah, if you do "creative" stuff. Not so much for data analysis and science-y stuff]) and look at a folder, then do View--->arrange icons by ---> modified, it will order the little file icons from the earliest last modification to the latest last modification. So if you put something in the wrong folder (like I just did), you can find it again with a minimum of "oh crap, oh CRAP, I KNOW I saved this!" muttering.

I found the function because I told myself, "they wouldn't save data on when files were last modified if there weren't a way to sort by when you last modified them." I'm gonna have to remember this because there are MANY times when I'm writing an exam or something, a student comes by, I fast save and close (so the student doesn't see any of the exam and get an unfair advantage) and find that, much searching later, I saved it in the "folder" for another course I teach, or one of my "research" folders.