hey, Othello
first of all, congratz for getting into such awesome programs.
i haven't heard anything from Columbia yet (probably they didn't think my past research projects were not too good of fit to their research? dunno...)
well, my girl friend got into Columbia and now i so wish i could go to Columbia too.
so, IF you're sure that you will not go to Columbia since you got into a bunch of 'better' programs, could you reject their offer?
good luck to your future career. it sounds like you will become a top-notch scientist!