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.
A missile launch facility, also known as an underground missile silo or launch facilityâLF, is a vertical cylindrical structure constructed underground, for the storage and launching of intercontinental ballistic missiles (ICBMs).ost silos were based in Colorado, Arizona, Nebraska, North Dakota, South Dakota, Montana, Wyoming and other western states away from heavily populated areas. They had many defense systems to keep out intruders and other defense systems to prevent destruction (See Project Safeguard).