ASML doesn’t let just anyone into its cleanroom. The Dutch powerhouse is the linchpin in the $600 billion global semiconductor supply chain, and its ultra-secure cleanroom in Veldhoven shows off the closest modern engineering has come to magic: ASML’s lithography machines etching miniscule transistors onto the chips that power all our lives. A speck of dust or an airborne microbe in the cleanroom could damage one of the $350 million machines. South Korean President Yoon Suk Yeol (left) an