Yes, one of my favorite Feynman lectures I was going to comment on, it re-appears in written form in the symmetry chapter in "Six Not-So-Easy Pieces". (Original

Yes, one of my favorite Feynman lectures I was going to comment on, it re-appears in written form in the symmetry chapter in "Six Not-So-Easy Pieces". (Originally from his massive Feynman Lectures on Physics.) He starts from after you've described the basic exterior human anatomy, which is mostly symmetrical, then he starts with the interior and tells the alien to 'put the heart on the left'. But the alien doesn't understand the direction. So Feynman says: "Listen, build yourself a magnet, and put the coils in, and put the current on, and then take some cobalt and lower the temperature. Arrange the experiment so the electrons go from the foot to the head, then the direction in which the current goes through the coils is the direction that goes in on what we call the right and comes out on the left." For anyone who doesn't get the wrong hand joke, the physical reason to watch out is: "matter to the right is symmetrical with antimatter to the left."