Evergreen needles act as air quality monitors

Every tree, even an evergreen, can be an air quality monitor. That's the conclusion of researchers at the University of Utah who measured the magnetism of particulate matter on the needles of evergreen trees on the U campus. ...

Slow earthquakes may foretell larger events

Monitoring slow earthquakes may provide a basis for reliable prediction in areas where slow quakes trigger normal earthquakes, according to Penn State geoscientists.

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