Actually the future is closer then you think. Interplanetary travel, humanoid androids and advanced flying crafts are all here. The thing is these kind of stuff are kept under the rug by the military/government and assessed by only the elites and need to know basis. It may be the same issue with scarless healing. I once read that military tech is AT LEAST 10-20 years ahead (If not maybe decades or centuries ahead even) of public technology that we know. It is not surprising since TRILLIONS of dollars are spent on research and black budget programs.