How does solar energy affect cloud formation? Why are tigers more beautiful than iguanas? What is the best subject to study at college? Should humans invest in space travel?
I gave my students this multiple choice question: Which question can be answered through scientific investigation?

Only one answer is correct among these 4 choices:
- How does solar energy affect cloud formation?
- Why are tigers more beautiful than iguanas?
- What is the best subject to study at college?
- Should humans invest in space travel?

Could you tell me which one is correct?

How does solar energy affect cloud formation?