Indus civilization regional drying urban growth decline

Drying may have first helped Indus cities grow

As the Indus region slowly became drier, the change may at first have helped its cities grow. As water became scarcer, it may later have helped drive the civilization’s decline and pushed people east.

A clay tablet may show the Pythagorean rule more than 1,000 years early

A Mesopotamian clay tablet from the 18th century BCE lists number groups such as 3-4-5 and 5-12-13. These numbers fit the relationship later called the Pythagorean theorem, suggesting people knew the pattern more than 1,000 years before Pythagoras.

A French-speaking ruling class permanently changed English

After the Norman Conquest in 1066, much of England's old ruling class was replaced by French-speaking nobles. Their language mixed with English over the following centuries and permanently changed its vocabulary.

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Indus civilization regional drying urban growth decline

Drying may have first helped Indus cities grow

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