Human enhancement is the idea that we can increase some of our basic biological capacities using technological or scientific means. The idea of increasing our capacities is an old one, of course we do it all the time with education, exercise and so forth. But, what's new now is that we might at least vaguely foresee our scanning the capability to apply science and technology directly to the human body. Perhaps we could learn to extend the healthy human lifespan by slowing down the aging process in the future, or we could maybe learn to increase our cognitive capacity through genetic engineering or our ability to concentrate through some drug or mental energy, maybe through some pharmacological intervention. So I think cognitive enhancements and health span extension would be two of the more exciting ones. You can also matter things that would work on our emotions and personality, I think there are certain risks involved in that. And, of course, cosmetic enhancements which are very popular, but I think basically a zero sum game just like athletic enhancements in competitive athletes. There is a kind of no net game if everybody runs one tenth of a second faster or if everybody has, like, one great whiter teeth I don't think on the net it has been progress. It's like, it might be good for the individual. So I think that making our life spans longer and better, and probably increasing our cognition, would be not good.