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.
Credit: NASA Wallops. The NASA Goddard Space Flight Center's Wallops Flight Facility is a rocket launch site on the eastern shore of Virginia. The site includes the Mid-Atlantic Regional Spaceport, which can send off interplanetary and International Space Station missions.