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Science news this week: Deadliest spiders, mysterious noises in space and 1.7 billion T. rexes


It’s been a busy week in science news when it comes to animals, where we discovered why a tiny jumping spider is such a bad actor, revised our best estimates for how many T. rexes once roamed Earth, and found out how Australian authorities are doing to save koalas from chlamydia. 

Elsewhere, a mysterious noise 70,000 feet (21,000 meters) up in the atmosphere is baffling scientists, while further afield, the James Webb Space Telescope has spotted what could be an ancient “water world” in a nearby star system.



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