The Philadelphia International Airport is the 9th busiest airport in the world. The Philadelphia Marketplace Food, Shops and services at the airport have a mind-boggling number of eateries, retail stores that sell everything that one can think of, and a number of newsstands.
(See a gallery of plesiosaur and pliosaur pictures.) Plesiosaurs (Greek for almost lizards) were large, long-necked, four-flippered marine reptiles that paddled their way through the oceans, lakes, rivers and swamps of the Jurassic and Cretaceous periods.
Plesiosaurs became extinct 65.5 million years ago, probably for the same reason the dinosaurs died out. The generally excepted theory is that an asteroid, 6 miles in diameter, crashed into the Yucatan Peninsula and threw dust into the atmosphere. The dust layer blocked the sun for months, killing plants and plankton.