Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Ex Input:
Question: What kind of health problem can occur in the kidney and potentially cause problems with urination? Answer: kidney stones

Ex Output:
Kidney stones are mineral crystals that form in urine inside the kidney. They may be extremely painful. If they block a ureter, they must be removed so urine can leave the kidney and be excreted.

Ex Input:
Question: What is the invisible force that pulls things to earth? Answer: gravity

Ex Output:
Gravity cannot be seen. It does not require things to touch. Gravity is an invisible force. Many things are pulled to the Earth by gravity. Can you think of some things that fall toward the Earth?.

Ex Input:
Question: What hydrocarbons contain only single bonds between carbon atoms? Answer: saturated hydrocarbons

Ex Output:
Saturated hydrocarbons are hydrocarbons that contain only single bonds between carbon atoms. As a result, each carbon atom is bonded to as many hydrogen atoms as possible.