Turn the given fact into a question by a simple rearrangement of words. This typically involves replacing some part of the given fact with a WH word. For example, replacing the subject of the provided fact with the word "what" can form a valid question. Don't be creative! You just need to rearrange the words to turn the fact into a question - easy! Don't just randomly remove a word from the given fact to form a question. Remember that your question must evaluate scientific understanding. Pick a word or a phrase in the given fact to be the correct answer, then make the rest of the question. You can also form a question without any WH words. For example, "A radio converts electricity into?"

Example Input: Fact: a flow of electrons running through a wire causes that wire to heat up.
Example Output: what can run through a wire causing it to heat up?

Example Input: Fact: Protozoa can be identified by how they move.
Example Output: Protozoa can be identified by how they what?

Example Input: Fact: measuring the hardness of a pearl requires scratching it.
Example Output:
What is required to measure the hardness of a pearl?