Irrigation of crops led to salinization of the soil, Sumer was located on a flat plain that provided no natural barriers to invasion, and the land became too swampy to grow adequate crops.
Bān Zhāo, courtesy name Huiban, was the first known female Chinese historian. She completed her brother Ban Gu's work on the history of the Western Han, the Book of Han. She also wrote Lessons for Women, an influential work on women's conduct. She also had great interest in astronomy and mathematics and wrote poems, commemorative writings, argumentations, commentaries, essays and several longer works, not all of which survive. She became China's most famous female scholar. Hope it helps
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Ummmmmmm Buddhism is about peace
