u.s what is a block

[cdn52]

when we hear an american,say its just 2 blocks away,just how big is a block and how do you get half a block why cant they just say take your second left and its on the right

[Quizmonster]

Click http://c2.com/cgi/wiki?CityBlock for an entertaining - and quite factual - website about what an American 'city block' actually is.