As a matter of fact, virtual humans are already helping to figure out the right radiation dose for pregnant women and defibrillator types for children. Virtualization technologies provide the opportunity to create anatomically accurate simulations of the human body with its organs. Obviously, the physiological properties may not be 100% accurate at the moment, but they sure will be quite soon. Even more, I believe at some point of time in the future we will have sophisticated virtual models of our own bodies, accurate even on the molecular level, depicting all the interactions between the molecules within our cells and tissues. This kind of in silico humans will provide us with the opportunity to test potential drugs for safety and efficiency and also model the aging and pathological processes on all levels in our bodies. This will definitely lead to significant life extension. All we need is accurate mathematical descriptions of biological processes and enough computational resources. Sounds impossible, but I’m quite optimistic, because the technological progress is growing exponentially, hence the probability of gaining sufficient knowledge and computer power within “observable” time frame is not that small.