Whereas parallel and distributed computing has always been used in the scientific community for decades, it is only recently being "discovered" by the general public. The near end of Moore's law, market economics, a critical mass in certain key markets and the diffusion of computer technology in situations where human lives are at stake are all catalysts in this phenomenon. A normal question that a scientist then wonders about : is there a (fundamental) limit ? If it is there, one should try to "prove" it. In this presentation, which also marks my personal restart in the WG10.3 community, I will try to show where this limit is, how it can also be found in nature in another context, and I will try to derive strategies to use once the limit is encountered.