Email exchange

I sent out a farewell email to some of my closer friends at work and in Belgrade before leaving Friday. I noted how I had grown and changed, etc... and I illustrated this point with the adage that a person never steps in the same river twice, because both s/he and the river are changed... here is one of the replies I got:

"...that actually is empirically tested in quantum physics, where it's impossible to know the "true" location and speed of a given particle as our very own observation of said particle inevitably changes one or both of these sizes.

"Things evolve man, and we all evolve along with them. Nothing evolves alone, and the actual "measure" of such evolvement is given by the interaction with everything else. "