It's now possible to jet around the world in 24 hours -- the same period of time that a traveler in 1800, using a horse and carriage, would have needed to get from New York City to Harrisburg, Pa. To illustrate the march of progress, University of Richmond researchers put together an interactive map showing how long it would take to reach different locations in the U.S. at different points of history.

Full Story:

Related Summaries