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What is a two by four? 
Ironically it is not 2 by 4 inches once you get to use it. These are the dimensions BEFORE planing. Once in use a 2x4 is 1.5 inches by 3.5 inches.
Does NZ use SI?
One possible explanation would be that the material the card is made out of likes to resist stretching or creasing. When you bend it, the best shape to avoid doing either of those things is to straighten up and become basically part of a cylinder.
Quote from: sophiecentaur on 27/04/2009 19:28:25Does NZ use SI?Doesn't everybody? Yes.
... But if I squeeze it the other way the card bends the other way, why's that?
Quote from: Chemistry4me on 29/04/2009 05:50:14... But if I squeeze it the other way the card bends the other way, why's that?What exactly do you mean by squeezing/bending "the other way"? Do you mean along the same axis but squeezing it 'in' instead of 'out', so that the 'flap' moves down instead of up?