A scientific question is a question that can be answered through empirical investigation, meaning it can be tested and potentially proven or disproven through observation, measurement, and experimentation.

Here are some characteristics of a scientific question:

1. Testable: The question must be able to be tested through an experiment or observation.

2. Specific: The question should be focused and clear, not broad or vague.

3. Measurable: The answer to the question should be able to be measured or observed in a quantifiable way.

4. Falsifiable: The question should be able to be proven wrong. This means it can be tested in a way that could potentially disprove the hypothesis.

5. Based on prior knowledge: The question should be based on existing knowledge and understanding of the subject matter.

Examples of scientific questions:

* Does fertilizer increase plant growth? (Testable, specific, measurable, falsifiable, based on prior knowledge about plants and nutrients)

* How does temperature affect the rate of enzyme activity? (Testable, specific, measurable, falsifiable, based on prior knowledge about enzymes and their function)

* What is the effect of caffeine on human reaction time? (Testable, specific, measurable, falsifiable, based on prior knowledge about caffeine and its effects)

Examples of questions that are NOT scientific:

* Is there life after death? (Not testable, not falsifiable)

* What is the meaning of life? (Not testable, not measurable)

* Is this painting beautiful? (Subjective, not measurable)

Remember, a scientific question should be framed in a way that allows for a systematic and objective investigation. It should be possible to gather data and evidence to support or refute the answer.