Barrett's esophagus refers to an abnormal change in the cells of the lower portion of the esophagus. It is characterized by the replacement of the normal stratified squamous epithelium lining of the esophagus by simple columnar epithelium with goblet cells (which are usually found lower in the gastrointestinal tract).
U.S. Space Camp is a camp and related programs owned and operated by the Alabama Space Science Exhibit Commission's U.S. Space & Rocket Center in Huntsville, Alabama.
Extraterrestrial Highway (near Area 51) Location: The Extraterrestrial Highway is a 92-mile portion of State Route 375, which runs between Hiko and Warm Springs. Located in Rachel, a small city 150 miles north from the Las Vegas Strip, you'll learn all about Area 51 and get breathtaking views of the Southwest desert.