This is from an 2010 BUHealth post, but I am reposting it now since the alpha site is still live and useful.
I thank BU alum Veronica Vargas for sending me the following link to a Wolfram alpha web site. It can be a waste of time, but it also can provide scientific, numeric, and demographic information that is calculated specific to your interests at remarkable speed. Visit it when you have time to kill. It seems to do most simple Mathematica can do without requiring any license.
Overview with lots of examples
Medical test examples useful for benchmarks.
county level info
Math results, of course, which is their traditional strength. http://www.wolframalpha.com/input/?i=x^2+sin%28x%29