WolframAlfa an answering search engine founded by Stephen Wolfram, It is an interesting search engine which reply your questions in a different way. It was announced few months ago and now finally launched. You can ask questions! Some examples you can see below.

If you ask who are you?

If you ask how you work?

If you enter a city name like Ahmedabad.

Wolfram has limitations also it can not answer all of your questions and still in development>