Exactly the same to the nanometer?

Question

Ok, ive heard somewhere (dunno where) that it is physically impossible for anything in the human body to be exactly the same, right down to the tiniest measurement. LIke your two legs cant be exactly the same, or your eyes, lungs, feet, or your fingers etc.

can anyone back this up and/or provide sources/links???

would like to know more about this...

Answer 1

http://en.wikipedia.org/wiki/Nanometer

http://www.nanooze.org/english/articles/...

http://searchcio-midmarket.techtarget.co...