|Knowledge is always moving, state is overrated.
Polymath is a special skill that essentially makes the character better at communication and IT tasks by allowing two additional private chat channels and granting 1 per day (with the ability to store 2). In turn, it makes them slightly less effective at manual tasks - all chance-based actions like repairing, ship/personal combat, or firefighting.
It has a unique synergy with IT Expert in that they both give the same special action points. A character with both skills will receive 3 per day, to a maximum of 6, which can be saved up for a burst of activity.
Apparently every action that involves a chance of success has that chance lowered by a relative -10%.
Allows up to five private communication channels instead of just three.
This skill was added in Episode 5.