Living things eventually die because their cells wear out, get damaged, and cannot repair themselves forever. All organisms have biological limits to how long their bodies can function.

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Science is a method for understanding the natural world through observation, experimentation, and evidence-based reasoning. Belief is accepting something as true without requiring proof or testing.

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Human rights are basic freedoms and protections that all people deserve simply because they are human, regardless of who they are or where they live. These include rights like freedom of speech, the right to a fair trial, and protection from torture.

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Money is anything widely accepted as payment for goods and services, and it serves as a store of value and a way to measure worth. Today, most money exists as digital numbers in bank accounts, coins, and paper bills.

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Agriculture was important because it allowed humans to stop moving around hunting and gathering food, and instead grow crops and raise animals in one place. This led to permanent settlements, larger populations, and the development of civilizations.

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