Space-station crew members just found an elusive air leak by watching tea leaves float in microgravity

NASA
The International Space Station has been leaking an unusual amount of air for more than a year. 
A cosmonaut finally found the leak by releasing tea leaves to float freely in the station's Russian side. He saw them cluster near a crack on the wall. 
The crew has temporarily patched the leak with tape, but it may not hold for long. 
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The International Space Station has been leaking an unusual amount of air since September 2019