At a government test site in Nevada last week, scientists generated a brief electrical pulse four times as powerful as all the electricity on Earth. It was all over in a few millionths of a second. And you should have seen the aluminum can. The 650-ton Atlas Pulsed Power Facility discharged nearly 19 million amperes through a liner, described as an aluminum shell the size of a tuna can. You might expect it would have exploded. Not exactly. The official line: "The current caused the liner to implode at extreme speeds, with unrivaled symmetry, precision and reproducibility." That means the...