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U.S. Sends More Troops to the Mideast as Iran War Expands

Gen. Dan Caine, the chairman of the Joint Chiefs of Staff, said more troops and fighter jets were heading to the region. He acknowledged...
HomeWorldHow Batteries Got Cheaper and Made the Electric Grid More Reliable

How Batteries Got Cheaper and Made the Electric Grid More Reliable

An early grid battery was installed in the Atacama Desert in Chile 15 years ago. Now, as prices have tumbled, they are increasingly being used around the world.