Which enlightenment thinker first proposed the idea of a social contract?
john locke
o thomas hobbes
o baron de montesquieu
jean-jacques rousseau

- "the most famous structure by far at saqqara is djoser's step pyramid. dating from the 3rd dynasty (2667—2448 bc), it was the first all-stone complex ever built on earth."

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studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.