Number Of Computations Done Since The Universe Began

A physicist has worked out how many calculations have happened since the Big Bang. We are all living inside a gigantic computer. No, not The Matrix: the Universe. Seth Lloyd, a physicist at the Massachusetts Institute of Technology in Cambridge, has estimated how much information the Universe can contain, and how many calculations it has performed since the Big Bang. Lloyd views every process, every change that takes place in the Universe, as a kind of computation. One way of looking at the exercise is to imagine setting up a simulation of the Universe, particle for particle, on a hypothetical super-duper computer.To simulate the Universe in every detail since time began, the computer would have to have 10^90 bits - binary digits, or devices capable of storing a 1 or a 0 - and it would have to perform 10^120 manipulations of those bits. Unfortunately there are probably only around 10^80 elementary particles in the Universe.
http://www.nature.com/nsu/020527/020527-16.html