PORTLAND, Maine (AP) — Fall is back, and bringing with it jack-o'-lanterns, football, pumpkin spice everything and — in some parts of the country — especially vibrant foliage. Leaves around the northern U.S. are starting to turn orange, yellow and red, inspiring legions of leaf lovers to hop in their cars and travel to the countryside for the best look at fall's fireworks. Leaf peeping — the act of traveling to witness nature's annual kaleidoscope — contributes billions of dollars to the economy, especially in New England and New York.