What's the world's oldest airport? Why is there an "X" in PDX? Is there a way to get a nap between flights? The following eight facts might change the way you catch your next plane — or at least end some mysteries.
From the towering Great Pyramids of Giza to the complex stepped pyramids of Mesoamerica, these seven facts reveal just how mind-blowing pyramids really are.
Are you careful around ladders, mirrors, and salt? In many cases, the origins of these superstitions have multiple layers, meaning they might go back to pagan, Christian, medieval, or Victorian beliefs all at once. In other cases, the story is far more modern than you might think.