US company Brick It sells the metal grids and thin bricks which fit onto the grids. They're available in different colours and styles. Watch the video to see how they are fitted. Produced by David ...

De Forest put a metal grid in the middle of the vacuum tube. By using a small input current to change the voltage on the grid, De Forest could control the flow of a second, more powerful current ...

President Donald Trump's metal tariffs could exacerbate that shortage, Currie said. Aluminum tariffs could also disrupt the grid by onshoring manufacturing of the energy-intensive metal ...