“To do successful research, you don't need to know everything, you just need to know one thing that isn't known.”
as quoted by [Steven Chu and Charles H. Townes, Biographical Memoirs V.83, National Academies Press, 2003, http://www.nap.edu/catalog.php?record_id=10830, 0-309-08699-X, 201]
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Arthur Leonard Schawlow 5
American physicist 1921–1999Related quotes

We The Living (1936)
Source: We The Living Part One Chapter 6
Splendid Isolation (1980) New Haven: Yale University Press. p. 38

The first two sentences of this statement first appear as attributed to France in the 1990s, but the full statement is earlier attributed to William Feather, as quoted in Telephony, Vol. 150 (1956), p. 23 http://books.google.com/books?id=Wm0jAQAAMAAJ&q=%22being+able+to+differentiate+between+what+you+do+know%22&dq=%22being+able+to+differentiate+between+what+you+do+know%22&hl=en&sa=X&ei=qYJOU9dAzoXRAYumgcAP&ved=0CMsCEOgBMDQ
Misattributed