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“Kryptos has not been solved,” said artist Jim Sanborn after releasing his parting clues to the “K4” section of his sculpture puzzle

Ten years after the Paris climate agreement, the limited progress we’ve made in reducing global warming means that there will be less extreme heat in the future than there would be without the accord

Early findings indicate that Epstein-Barr Virus may also cause the autoimmune disease lupus

The International Energy Agency says weak climate action and energy security fears are effectively delaying peak fossil fuel consumption

A severe geomagnetic storm brought spectacular auroras to much of the U.S. on Tuesday night