Firebricks — heat-resistant bricks designed to withstand and store high temperatures without getting damaged — were developed during the early Bronze Age. They were used to line primitive kilns dug into the ground. Now, researchers believe they could play a role in our energy transition. Heat batteriesThese bricks are composed of specific materials such as alumina, silica, and magnesia, which give them high densities, and melting points. This makes them ideal for storing heat generated from excess renewable electricity. The cost advantage of firebricks is significant, though it’s not obvious a…