Spencer Webb, president of antenna design and consulting firm AntennaSys, has written a nice explanation of how cell phone antennas are designed and tested, and how this may play into the reception problems iPhone 4 users are experiencing when holding the phone in certain ways. 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-]).
- ExtraBITS for 28 June 2010 (28 Jun 10)
More Details on the iPhone 4 Antenna Issue