An economy is the system of money, jobs, and buying and selling that a country or region uses to produce and distribute goods and services. It involves people working, businesses making products, and consumers purchasing what they need.

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Writing was a turning point because it allowed humans to record and preserve information permanently, rather than relying on memory alone. This enabled the growth of complex societies, trade, laws, and the accumulation of knowledge across generations.

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The Milky Way is a giant spiral galaxy containing hundreds of billions of stars, and our Sun and Earth are located in one of its outer spiral arms called the Orion Arm, about 26,000 light-years from the galaxy's center.

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Consciousness is the subjective experience of being aware of yourself, your surroundings, and your thoughts—essentially what it feels like to be you. It's hard to explain because scientists don't yet fully understand how the physical brain creates these subjective experiences.

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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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