All scientific discoveries are based solely on observation and never experimentation. Sometimes scientific discoveries are made by accident, like the discovery of penicillin. If a scientist cannot provide the exact time and place his or her discovery was made, it is dismissed. All scientific discoveries are regulated by government agencies, like the Food and Drug Administration.
I gave my students this multiple choice question: Which is true of scientific discoveries?

Only one answer is correct among these 4 choices:
- All scientific discoveries are based solely on observation and never experimentation.
- Sometimes scientific discoveries are made by accident, like the discovery of penicillin.
- If a scientist cannot provide the exact time and place his or her discovery was made, it is dismissed.
- All scientific discoveries are regulated by government agencies, like the Food and Drug Administration.

Could you tell me which one is correct?

Sometimes scientific discoveries are made by accident, like the discovery of penicillin.