In the early 1900s cruise liners like the Titanic were the only mode of transportation available between the United States and Europe. The journey could take weeks in some cases. How has transportation changed since then?

Today, there are planes, automobiles, subways, etc. Technology and science has had the biggest influence on transportation. Engineers and physicists have made it possible to take 150 people and fly them across the ocean. Automobile designers continue to find greener ways to build cars that will emit less pollution.