Apple is at the top of its game now, but that level of success isn’t entirely attributable to its products. Multi-hyphenate Stephen Fry has been carrying multiple cellular phones — and smartphones — since long before 2007, and he writes about how the failures of Apple’s competition since the introduction of the iPhone have helped Apple reshape the market.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-]).
Stephen Fry on What the iPhone’s Competitors Missed