Google's main product, the search engine, is a versatile tool. Most of you will probably only use Google's search facilities by keying in a couple of words and use the resulted list. But Google can do so much more. Key in "5 * 10" and press enter, it will calculate. And this is minor. Lifehacker recently showed another cool thing Google's search engine can do : package tracing.

Tech-book site Informit offers 15 unusual ways to use google search, including tracking packages, converting units of measure and providing encyclopedic information.(Lifehacker)

Exploring Google's Hidden features