Patently Apple reports on a new patent granted to Apple that describes a 3D display and imaging system. It apparently watches a space in front of the user, enabling her to work with holographic images or virtual representations of her hands that can manipulate virtual objects. It’s hard to see this appearing in a shipping product soon, but Apple’s research labs clearly understand the need to define new forms of virtual interaction that go beyond the keyboard, mouse, and touchscreen. 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-]).
Apple Receives 3D Display and Imaging System Patent