On Saturday, Comet turns her desk lamp upside down and reads the small label on its base.
"Somebody made the bulb, somebody made the cord, and somebody put it all together," she says. "I never thought about it."
Wren laughs. "That is a value chain. What does the evidence say? How much can you actually find out from the outside?"
Comet squints at the label. "Some of it. Not all of it. Just like SH-1."
Nova hovers beside the lamp. "Would you like a hint?" she asks. "Write down what you know, what you guess and what you cannot tell."
Wren grins at you. "Reviewer, try it with your family."
| Example: a desk lamp | What we know | What we can guess | What we cannot tell |
|---|---|---|---|
| Bulb | It fits the lamp | Made by a different maker than the lamp | Who made it |
| Cord and plug | They are attached to the lamp | Made in a factory | Who checked them |
| Whole lamp | Where the label says it was put together | Several makers sent parts | Every maker's name |
| Shade | Its color | Made of cloth or paper | Where the material came from |