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.
The best I can do to describe it in this essay is to offer you a sample play by play from a good brainstorming meeting. Assume these people all work on the same team, and have been given the problem of improving communication on the team. Bob is the team manager; everyone else works on his team.