Yeah David that is a great video, not sure whether it was a link from elsewhere on this forum or not but thought it worth reposting even if it were.
When I looked at the map of the ISS track is seems to follow a sine wave course. Curious, I thought orbits would be more straight line following the curvature of the orb we live on. After all the thing is falling at the same rate as it's rotation. (I think that's how it works?)