It is hard to underestimate the importance of the search nowadays. It probably even occurs without being noticed, but try to count how many times a day you tried to search for a product online, search through an online catalogue, an abbreviation or simply a weather forecast? Even a simple one page document or a webpage offers search capabilities (Ctrl-F). But have you ever wondered about how fast the search through Wiki is or how exact it is, even correcting your misspellings? These and more elaborate ......