 This also establishes the tendencies for time-travelers to go through genetic scrambling, also to minimize the effect on the time-stream.Notably, the scrambling tends to cause similar looks among differing males who undergo the process.A defendant who is found guilty in one of these trials is executed with a weapon called the Retroactive Cannon, or Ret Can, which erases the victim, deleting their existence from the universe by undoing their birth and entire history.