Samuel Langhorne Clemens, better known as Mark Twain, was born on November 30, 1835. He was an accomplished writer, among other things, and is responsible for bringing us classic characters such as Tom Sawyer and Huckleberry Finn. To celebrate, a humorous quote by Mark Twain is hidden in the block below. To reveal it, you must cross out two letters in each of the block’s 49 boxes. Each ACROSS and DOWN clue leads to a seven-letter answer.