Mesopotamian tablet number triples Pythagorean theorem

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.

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Tumors can reduce the signals on their surface that killer T cells use to recognize them. They can also release signals that weaken immune cells. Both tricks can help abnormal cells survive and grow into cancer.

Offshore fishing spread before cod stocks collapsed

From the 1950s to the 1970s, fleets fishing far from home greatly increased their capacity and reached farther offshore and into deeper waters. Rules for fishing in international waters were slow to develop. By the early 1990s, the cod fishery had collapsed, along with stocks of several deep-sea fish.

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Mesopotamian tablet number triples Pythagorean theorem

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

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