Mark Twain's Life Lessons to Learn in Youth and Avoid Regrets in Old Age.

Mark Twain was an American writer, humorist, entrepreneur, publisher, and lecturer. Mark Twain was lauded as the "greatest humorist the United States has produced," and William Faulkner called him "the father of American literature". Mark Twain's novels include The Adventures of Tom Sawyer and its sequel, the Adventures of Huckleberry Finn