I think that many of my ideas are correct, but I'll bet you, before my death other discoveries will be made that will prompt me to alter various ideas I have about human evolution.
-- Donald Johanson
   
Donald Johanson   Name:
Donald Johanson
Type:
Scientist
Nationality:
American
Birth:
June 28, 1943
https://www.nutquote.com/quote/Donald_Johanson