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A powerful 7.4-magnitude earthquake struck western Colombia on Monday, shaking the South American nation and neighboring Ecuador and prompting people to evacuate homes and buildings.

A powerful earthquake, initially measured at magnitude 7.4, has struck Colombia. Tremors were also felt in neighboring Ecuador, as well as in Panama and Venezuela.

A human kidney is built once, before birth, and the rules guiding its construction have been largely inferred from animal models. Researchers at Penn Medicine have now read those rules directly in human tissue. They found that developing cells are steered by soluble signals relea