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.
FAS | Nuke | Guide | USA | C3I |||| Index | Search |. Camp David Presidential Retreat Site. Located 70 miles from the White House in the Catoctin Mountains of Maryland, Camp David was established in 1942 as a place for the President to relax and entertain.