So, as I mentioned at one point, I use the RP1 to track ToDo lists for different areas of my life, including: my programming work, study of the classical guitar, exercise, etc.
Well, here is an article that shows Leonardo Da Vinci's ToDo list from 1490:
http://www.openculture.com/2014/12/l...han-yours.html
I think Leonardo would have loved the RP1, but that is just conjecture, of course.