Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

[EX Q]: Fact: the shape of an object can be discovered through feeling that object
[EX A]: braille is read by using your fingers to?

[EX Q]: Fact: An example of a fossil is a footprint in a rock
[EX A]: I found an impression of bird's feet in a rock?

[EX Q]: Fact: fire gives off light
[EX A]:
A person is in the forest, lost. They need to signal to others that they are there, and their voice is gone, so they need to do it inaudibly. The person may signal with?