evidence: FACT CHECK: Did Einstein Say, ‘Certain People Appear Bright Until You Hear Them Speak’? A Facebook post claims that theoretical physicist Albert Einstein once said, "We all know that light travels faster than sound. [...] While the theoretical physicist did discuss the speed of light in his writings, there is no evidence that Einstein authored this specific saying. A search of the Einstein Archive Online returned no results. It also doesn’t appear in Alice Calaprice’s "The Ultimate Quotable Einstein," which contains more than 1,000 verified sayings and quips from Einstein.