Microsoft has launched a new version of its flagship notebook computer, the Surface Book 2. The new machine has updated design, updated internals, updated connectivity, improved battery life and now comes in two sizes. The Surface Book 2 looks mostly similar to the original, with a removable tablet screen that has its own processor and battery that can be plugged into the keyboard facing either direction for even more performance and battery life. The design has been updated in small ways, such as in the way the hinge works and the keyboard, which makes it work a bit better. But the biggest new feature is that the new Surface Book 2 comes in two sizes, 13.5-inch and 15-inch. The smaller model has a 3000x2000 display and the larger one has a 3240x2160 display, both being touchscreens and compatible with the new Surface Pen and Surface Dial. The 15-inch model has ventilation along the display for fans but the 13.5-inch model has fanless. Inside, both models are powered by the...