Climate Point: 3 billion people may need to move in the next 50 years because it’s too hot

11 things you need to know about flying discount airlines Spirit, Frontier and Allegiant

Spirit, Frontier and Allegiant charge for carry-on bags, don’t offer free advance seat assignments and make you buy your own soft drinks.

American road trip: The 50 longest highways in the US

While driving across the U.S., it might seem like some highways are never-ending, but which one’s actually the longest? Hint: One end begins in Boston.

50 state road trip: Landmarks that represent each state

These destinations each represent an historic, popular, or scenic destination in each state.