Mysterious bright flash is a black hole jet pointing straight at Earth

Astronomers at the U believe the jet was produced by a black hole that began devouring a nearby star, releasing a huge amount of energy in the process.

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Ribs evolved for movement first, then co-opted for breathing

A major transformation in vertebrate evolution was when breathing shifted from the head to the torso in reptiles. But what caused the shift? A study hypothesizes it was driven by locomotion.

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