Wolfram|Alpha
We know search engines like Google, Bing, AltaVista etc. if we want to know where something is. We know Wikipedia if we want to know what something is. But what if we want to count something? What if we want to know some currency conversion? Let's use computational knowledge engine Wolfram|Alpha (www.wolframalpha.com) to know it in one click. You can try mathematical calculations, populations, use it as dictionary and many more!

