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

Input: Consider Input: Atoms of metals are good conductors of electricity because they give up electrons.

Output: Why are atoms of metals good conductors of electricity?


Input: Consider Input: A concave lens is thicker at the edges than it is in the middle.

Output: What type of lens is thicker at the edges than it is in the middle?


Input: Consider Input: Radioactive decay can give off energy and particles.
Output: Radioactive decay can give off energy and what else?