This program showcases the Great Basin bristlecone pines, the oldest living things on earth. Some of these trees have been alive for almost 5,000 years, but that is not the only reason they are unique -- they have also led scientists and historians to key discoveries. This video examines the history of the discovery of the bristlecone pines including the work of dendrochronologists Andrew Douglass, Edmund Schulman and Charles Wesley Ferguson and the contributions of these trees to archeological dating, dendrochronology and dendroclimatology.