— Richard Feynman American theoretical physicist 1918 - 1988
Context: Feynman's IQ was measured at 124 when he was young — well above average, but far from genius level. So how'd he become fluent in differential equations by the age of 15? Feynman's fascination with the inner workings of the mechanical objects around him couldn't have hurt his left-brain power. As a kid living in Queens, he took apart everything from radios to wagon wheels. This wide-eyed fascination stuck with him; for his entire life, Feynman's colleagues cited his "childlike" approach to physics problems, which bore great results. In fact, a fellow physicist once said that the “Feynman Problem Solving Algorithm” contained three steps: 1. Write down the problem. 2. Think very hard. 3. Write down the answer.
Will Pearson, Mangesh Hattikudur and John Green, Mental Floss: Genius Instruction Manual (2006), chapter: "If It's Too Late For You: The Science Edition", section: "Strategy 1: Let Them Tinker", p. 60
The "fellow physicist" was Murray Gell-Mann.