A vulnerability in iOS 6 and OS X 10.8 Mountain Lion can crash apps and even render them unusable if certain strings of text are rendered. The text strings can cause Messages and Safari to crash, and can cause additional errors if a Wi-Fi network is named with the text. The problem is reportedly fixed in the betas of iOS 7 and OS X 10.9 Mavericks, but we expect Apple to address it in iOS 6 and Mountain Lion updates as well. follow link
Full Screen Quick Look in Snow Leopard
When viewing files in the Finder in Snow Leopard, instead of pressing just the Space bar to enter Quick Look, press Option-Space to display the selected document in full-screen Quick Look, expanding the preview and hiding everything else that would otherwise remain visible.
Text Display Bug Can Render Apps Unusable