We hardly know the limit of intelligence of individuals who can fruitfully contribute to science in one way or another if they are given the proper training – including graduate training – as assistants, as supervised or semi-independent researchers, as team members. Individuals with any of a very broad spectrum of intellectual attributes can contribute to science.

in Criteria for Federal Support of Science: A Panel Discussion Arranged by the Division of Physical Sciences, National Research Council, March 11, 1968. National Academy of Sciences. 1969. p. 17.