Back in the 1930s, building Hoover Dam was a public works project likened to the pyramids. Hoover Dam helped transform the American West, harnessing the force of the Colorado River to power millions of homes and businesses.
Firebricks, which are bricks designed to withstand high heat, have been around for more than 3000 years. The Hittites used them to line iron-smelting kilns. They are simply bricks made from clays that can withstand much higher temperatures than ordinary bricks.
