Because we are so far off being able to simulate biological systems it is easier to do other things.<p>There is some work in this though, but often going the other way: see for example <a href="http:&#x2F;&#x2F;news.discovery.com&#x2F;tech&#x2F;robotics&#x2F;brain-dish-flies-plane-041022.htm" rel="nofollow">http:&#x2F;&#x2F;news.discovery.com&#x2F;tech&#x2F;robotics&#x2F;brain-dish-flies-pla...</a> and even more extreme <a href="http:&#x2F;&#x2F;www.nature.com&#x2F;articles&#x2F;srep11869" rel="nofollow">http:&#x2F;&#x2F;www.nature.com&#x2F;articles&#x2F;srep11869</a>