Speech at my 2013 conference TIME TRAVEL AND OTHER WORLDS by the late brilliant scientist Preston Nichols. Highly recommended. Also see: link to Preston’s books on Amazon: https://www.amazon.com/s?k=preston+nichols&i=stripbooks&crid=1JV8YRM62KE5N&sprefix=preston+nichols%2Cstripbooks%2C159&ref=nb_sb_noss_2