The Mammoth Site is a museum and paleontological site near Hot Springs, South Dakota. It contains the remains of fauna and flora preserved by entrapment in a karst sinkhole during the Pleistocene era. Mammoth bones were found at the site in 1974, and a museum and building enclosing the site were established. The museum now contains an extensive collection of mammoth remains.
The Common Whitetail or Long-tailed Skimmer (Libellula Lydia, also Plathemis lydia ) is a common dragonfly across much of North America, with a striking and unusual appearance. The Common Whitetail can be seen hawking for mosquitoes and other small flying insects over ponds, marshes, and slow-moving rivers in most regions except the higher mountain regions.
A photovoltaic array or a solar array is a linked collection of photovoltaic modules, which are in turn made of multiple interconnected solar cells. By their modularity, they are able to be configured to supply most loads. The cells convert solar energy into direct current electricity via the photovoltaic effect.
