Bing and Wolfram Alpha

In what is a useful direction, Bing and Wolfram Alpha are collaborating. Google already does some of this by understanding some kinds of numerical dimensionality to answer searches like: 'How many quarts in a peck'. The Bing approach then links to tables that do appropriate numerical analysis. So if you ask it to calculate bmi (Body mass index) it shows a table for the required input and does the calculation. Wolfram provides the tables. Its the proper choice of tables that may be the trick.