Over at Macworld, Lex Friedman explains how to turn on and use two-factor authentication with a Google account to combine a fixed password with a constantly updated additional code sent as a text message or accessible from a smartphone app. Be aware that two-factor authentication may be more trouble than it’s worth, depending on how often you need to sign into your Google account. follow link
Calculate with Spotlight
Have a quick calculation to perform? Don't bother opening Calculator, simply enter the calculation into Spotlight's search bar, and Spotlight displays the answer as the top item. To perform further calculations, hit Return, or click the answer, and Spotlight launches Calculator.
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Enable Google’s Two-Factor Login