[MD] 2 + 2 = 5?

[Case]

[Case] 
I put "rounding error" among by 20 ideas that shook the world. The butterfly
effect essentially results from "rounding error." It is that little bit of
slop we can never clean up. Even in the esoteric whirled of mathematics,
irrational numbers are examples of "rounding error" gone wild.


[Kevin]
"rounding error" as cause???  As in it caused the world to shake, causes
Chinese butterflies to flap their wings and causes irrational numbers to
transcend???
 
Stay too long in the world of metaphors and backasswards begins to look
normal.


[Case]
I looked really hard for the word cause in the paragraph above. Help me out
here I can't find it.