i have come to believe that it may be possible to flash freeze the human body, then quickly heat the entire body using gamma radiation at a specific wavelength to return the body back to its original state. i have encountered gamma radiation that changed the overall temperature of the human body, so it has led me to believe the above. my guess is you would use something like liquid nitrogen for the freezing process. i have no legal way of testing this (mice maybe?) as i do not currently have the required license for emitting gamma. let me know if you try it out!