Prof. Duncan McDougall of the Plymouth State University of New Hampshire
https://www.facebook.com/video.php?v=603063746415349&theater
https://www.facebook.com/video.php?v=603067426414981
https://www.facebook.com/video.php?v=603066519748405&theater
https://www.facebook.com/video.php?v=603066089748448&theater