A Crowdsourcing Solution to Subway Tracking

Great idea.

Small nit to pick. At 0:25 he claims the New York City subway is the oldest in the world, but it first demonstrated in 1869 [1], whereas the London Underground first opened in 1863 [2].

[1] http://en.wikipedia.org/wiki/New_York_City_Subway#History

[2] http://en.wikipedia.org/wiki/London_Underground

But it's still a cool way to get and extract the data needed.