Here’s a cool explanation. http://www.xamuel.com/spaced-repetition-systems/
The following bit caught my attention. The guy is experimenting with SRS and listening to music.
“Basically, if you listen to the same song over and over, it gets tiresome. And if you haven’t listened to a song in awhile, it sounds better. Hmmm, this sounds analogous to something, doesn’t it…”
The last sentence also snagged my attention. “…SRS’s are so cutting edge and elite, they haven’t made their way into the classroom yet.”
-I am about to change that.