The Nature of Things - Season 64

20 July 1971, Nepean, Ontario, Canada

8 May 1926, London, England, UK

29 October 1958, Baden-Baden, West Germany

1953, Montreal, Quebec, Canada

19 June 1954, Australia

1971, Buffalo, New York, USA

May 29, 1932 in Philadelphia, Pennsylvania, USA

2 January 1920, Petrovichi, Klimovichi, Gomel Governorate, RSFSR [now Smolensk Oblast, Russia]

23 October 1976, Vancouver, British Columbia, Canada