Wow... Spotlight has a lot of functions. Spotlight is the little search icon located to the top right corner of your macintosh's screen. When you click it, it open a little drop down search. Type in your search file's name to locate. If you type
an arithmatic calculation, the first result is the answer. For example if you type "23+26", the first result will be "23+26 = 49". If you type in any word from the english dictionary, the first result will be the meaning of the word; clicking on this first result will take you to the dictionary application of mac with the said word's meaning opened.