Mesofacts: slowly changing facts

It would be interesting to see an overlay of the progression of UN membership and the World Reord 100 meter dash by decade.

I think of it as laying on a transparency overlay, but can you do it with your computer designs?
I am really interested in what you are doing because I have always watched for patterns and relationships in
events and time period comparisons.
Hope that made sense!
Please keep it up.
Thanks