Kepler & K2 provide long-baseline, high-precision photometry for exoplanet and astrophysics research.
The basic and most common additional rule for Doubles play is that where a Double exists at the end of any train, the Double must then be 'satisfied' (laid against) in the next turn, even if the Double is on another player's train that is not marked.
A Typical Train the Trainer course. A good start for a trainer is to learn the basics of putting together a training session and delivering this session in an interactive way. Here is a 2 day course which covers all the key areas of trainer training.