evidence: An image shared on Facebook claims that author Mark Twain once said, "Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do." [...] Although Brown credited his mother with the saying, it was only a matter of years before others erroneously attributed the quote to Twain, author of American classics like "The Adventures of Huckleberry Finn" and "Life on the Mississippi." [...] "Though he’s not the source of this aphorism, Twain did frequently endorse the benefit of taking risks and trying new things, particularly exploring unfamiliar places and cultures," Matthew Seybold, assistant professor of American literature at Elmira College and editor-in-chief of MarkTwainStudies.org, told The Daily Caller in an email.