Identify the man in the middle of this recent Google doodle, celebrating his 100th birthday - he famously discovered X, and even more famously, refused to patent it, remarking : "There is no patent. Could you patent the sun?".
Also, X? - X, quoting a 2009 documentary, helped to solve "America's biggest problem apart from the atomic bomb".
[Highlight blank after arrow for the answer]
=> Jonas Salk - discovered the Polio vaccine.
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