In the Canadian province of Alberta, the epicenter of a boom in the production of bitumen from oil sands, senior geoscientists saw a 14.5% rise in salary this year, to $231,000. When you include overtime, truck drivers in the province are earning up to $170,000.
The System Preferences application is found in your Applications folder and is also available at any time from the Apple menu at the top-left of the screen (click the Apple logo). It may also be in your Dock at the bottom of the screen - the icon is a set of interlinked cogs, like the image above.
Choose a screen saver. Your Mac comes with several screen savers that display photos, messages, artwork from your iTunes library or photo library, and more. From the Apple menu, choose System Preferences, then click Desktop & Screen Saver. Click the Screen Saver tab. Screen savers appear on left side of the window, and a preview of the selected screen saver appears on the right. Click a screen saver to select it.