Extraordinary claims require extraordinary proof
is found at a lot of sites and has become so ubiquitous that it usually has no attribution. A Time article simply said "Scientists say." Well, the originator of the quote is the physicist Murray Gell-Mann.
It is always a thrill to have met someone who, besides being a great scientist, has such a way with language. When I was an undergraduate at Cal-Tech, our house had regular dinners with the Institute's staff. Afterwards, we would sit in the lounge, drinking and quizzing the scientists. I have forgotten many of these people, but Murray Gell-Mann was unforgettable. All the physics majors regarded Gell-Mann and Feynman as gods. Being a biologist, I was interested in them for other reasons. Gell-Mann talked about a lot of things, but very little physics. He was my first real exposure to a polymath. He talked authoritatively about a world of ideas. He seemed to know EVERYTHING about EVERYTHING. He discussed the, at that time, undeciphered language, Linear B. Not quantum physics, but extinct languages. My favorite memory was when one of the hotshot physics majors asked Gell-Mann why he did not teach any undergraduate courses (Feynman taught one of the most popular physics classes to freshman and sophmores.). Gell-Mann, to paraphrase since time has muddled the memory, said that undergraduates were not sharp enough to understand what he had to say. He taught graduate student level classes because there was some hope for them. Not a humble man, but certainly a brilliant one.