Easily Power Down MacBook Display

With Mavericks, the Power button on your MacBook keyboard gains a new function. Like before, you can hold it down for three seconds to get the option to shut down, sleep or restart. But if you hold it for only one second and then release, it will quickly put your screen to sleep. This way you can save battery if you don’t need to use your MacBook for a few minutes but know you’ll return to it shortly and don’t want to put it fully asleep. You can wake up the screen by tapping the spacebar.