Each session starts with something to do: check a claim and then what the check takes for granted, or sort claims into the water and the river-bed for two different years.
Then answer questions about what you saw. A wrong answer gets a reply explaining why; try again.
Each round ends with the point it shows, and each session with the passage it comes from.
The idea
Doubting needs something it does not doubt, as a door needs hinges that stay put.
