Answer:
I think it's the relevant information that supports an argument or the opposing argument to the main viewpoint.
How about a history project on the Mayflower?
It is the ship that carried the Pilgrims to the New World.
You would get to build a model ship, and you would need to put together display telling how the Mayflower helped the Pilgrims across the ocean.
A package with the handkerchief that makes dogs lose their sense of smell.
