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?"

Q: Fact: water causes light rays to bend.

A: What happens to light rays in water?
****
Q: Fact: Hermit crabs use dead snail shells for houses.

A: What do hermit crabs use for houses?
****
Q: Fact: weightlifting has a positive impact on a human 's health.

A:
What has a positive impact on a human 's health?
****