Or at least a chrome extension.
The Dictionary of Numbers is a browser add on that gives context to the numbers people throw out there. Apparently it will add in line context to numbers it encounters (ie 8 million people = about the population of NYC), and also provides a search function when that doesn't work.
I'm going to try this out and see how I like it. Intentionally or not, people are always throwing out big numbers without proper context, and something like this could really help mollify that.
I'll be reporting back.