evidence: On Nov. 2, 2022, we received an email from a reader who attached a quote meme and asked if it's true that author Mark Twain once said, "The truth has no defense against a fool determined to believe a lie." The reader said that they saw the meme on the Tribel social media app. A quick search of old books on the Google Books search engine showed that this was not a genuine quote from Twain. We found no literature from the 20th century that mentioned the sentence. A quote from a famous person such as Mark Twain, which was a pseudonym of Samuel Clemens, would not suddenly appear for the first time on the internet long after his death in 1910.