Google is now an automaker of sorts. It has built a prototype of its long-brewing self-driving car, which looks like a mix between a Volkswagen Beetle and a Smart Fortwo. The car features no manual controls, and, as a precaution, is limited to 25 miles per hour. Google has produced a video showing it being test-driven by a number of people — including a blind man. follow link
Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
Google Unveils Its Self-Driving Car