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

Example Input: Seismologists originally measured the intensity of an earthquake with the mercalli scale.
Example Output: How did seismologists originally measure the intensity of an earthquake?

Example Input: Most hormones are produced by the endocrine system.
Example Output: Most hormones are produced by which human organ system?

Example Input: Tributaries is the term for small streams.
Example Output:
What is the term for small streams?