* Testable: Science relies on observations and experiments that can be repeated and verified by other scientists. If something can't be tested, it's outside the realm of science.

* Falsifiable: A scientific hypothesis or theory must be capable of being proven wrong. This means there must be possible observations or experiments that could disprove it. If something is immune to being disproven, it's not scientific.

What science doesn't address:

* Matters of faith, belief, or personal values: These are subjective and not based on empirical evidence.

* Metaphysical questions: Questions about the nature of reality, consciousness, or the meaning of life are beyond the scope of science.

* Ethical or moral issues: While science can inform ethical decisions, it doesn't provide definitive answers to moral dilemmas.

In essence, science is a systematic and logical approach to understanding the natural world through observation, experimentation, and evidence-based reasoning.