New here? Start with these

Every category in this library opens with a short "what is X?" session that lays down the vocabulary the rest of the category builds on. Start with The Unstuck Machine, the first session to run with your kid.

Before that, run Heads, Tails, and Why the Coin Doesn't Remember on your own, with no kid in the room. It is a real session with you as the kid, and it is the fastest way to learn what running one feels like. The tutorial walks through both.