Heard yesterday on TV, while browsing informations. A Ph.D. student in signal processing applied to music AFAICR. He was building carbon based guitars:
The problem with wood is that it's impossible to build two exactly identical guitars...
So, OK, I was zapping, this may be a bit out of context, but still. This guy had better work in biology instead. Because we have some more serious issues there. For instance, the problem with flesh is that it's impossible to build two exactly identical humans !