Nations That Don't Use The Metric System

> Edit: sorry, I think 2 by 4 is in cms.


Nope, that would make it less then and inch by about 4/5 of an inch.

Here is an article on why 2x4 ends up being 1.5 by 3.5 (which sounds plausible enough but could be a total crock for all I know)

http://ask.yahoo.com/20001010.html