Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Example Input: The long, threadlike extensions of the nerve cell help transmit nerve impulses.
Example Output: Which part of the nerve cell helps transmit nerve impulses?

Example Input: People stopped adding lead to gasoline because of environmental pollution.
Example Output: Why did people stop adding lead to gasoline?

Example Input: Thrust is the force pushing a rocket.
Example Output:
What is the force pushing a rocket called?