Apple has released three System Management Controller (SMC) firmware updates for its MacBook lineup: MacBook SMC Firmware Update 1.5 (494 KB), MacBook Pro SMC Firmware Update 1.6 (666 KB), and MacBook Air SMC Update 1.8 (982 KB). All three address a “rare issue” that caused laptops with a battery that had accumulated more than 1,000 charge cycles to shut down and possibly fail to boot back up again. According to this Apple support page, all recent MacBook Pro and MacBook Air models (as well as MacBook models from 2009 and later) have a lifetime expectancy of 1,000 charge cycles. As always with firmware updates, we recommend relying on Software Update or the App Store app to ensure you get the firmware update for your specific model, and be careful not to interrupt the update process. (Free)
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-]).
- MacBook Pro SMC Firmware Update 1.7 (12 Feb 13)
SMC Firmware Updates for MacBook, MacBook Pro, and MacBook Air
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