re: What did the Egyptians contribute to society?

they created the first emojis

They were the first to say the earth was round

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The first (official) measurement of the radius of the earth was made by Erasthenes (b. 275 B.C.), who was the head of the great library of Alexandria. He was born in Cyrene, now Libya. It seems likely that the ancient Egyptians, much before Egypt's conquest by Alexander the great, had already grasped the idea of a spherical Earth, and it was from them that this doctrine was adopted by Pythagoras, who, as we know, spent many years of study in Egypt. (1)

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Laid the groundwork for early astronomy

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Knowledge of stellar constellations - At least 43 constellations were familiar to the Egyptians in the 13th century B.C. (1).

The oldest known copies of an almanac date from 1220 BC at the time of Ramses the Great. In 1100 BC Amenhope wrote "Catalog of the Universe" in which he identified the major known constellations.

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They also created the idea of a 24 hour day, a 365 day year, the sun dial and used their architecture to predict phenomena in astronomy such as eclipses and equinoxes

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