Perfect as the wing of a bird may be, it will never enable the bird to fly if unsupported by the air. Facts are the air of science. Without them a man of science can never rise.
-- Ivan Pavlov
   
Ivan Pavlov   Name:
Ivan Pavlov
Type:
Psychologist
Nationality:
Russian
Birth:
September 14, 1849
Death:
February 27, 1936
https://www.nutquote.com/quote/Ivan_Pavlov