Social Sciences. In short, a two-mode is a hybrid vehicle that can operate in two distinct ways (modes). The first mode works much like a regular full hybrid. It is the second mode that makes the difference--where the hybrid system can adjust varying amounts of engine and motor function to meet very specific vehicle/task/traffic requirements.
Twain's first book, The Innocents Abroad, was published in 1869, The Adventures of Tom Sawyer in 1876, and The Adventures of Huckleberry Finn in 1885. He wrote 28 books and numerous short stories, letters and sketches. Mark Twain passed away on April 21, 1910, but has a following still today.
The Adventures of Tom Sawyer. Not counting The Gilded Age, which was co-authored with Charles Dudley Warner, The Adventures of Tom Sawyer was Mark Twain's first novel. By the time MT died, it had become an American classic, and it remains perhaps the best-loved of all his books among general readers.