Quantum electrodynamics, commonly referred to as QED, is a quantum field theory of the electromagnetic force. Taking the example of the force between two electrons, the classical theory of electromagnetism would describe it as arising from the electric field produced by each electron at the position of the other.
Season 2. Season 4. Season 3 of Vikings premiered on February 19, 2015 on History in Canada and in the United States and concluded on April 23, 2015, consisting of 10 episodes. The new 10-episode season begins with...
Official Status: Vikings Renewed For Season 5 By History! On March 26, 2015, History renewed Vikings for an extended 20-episode fourth season, which will air in two 10-episode batches. Vikings Season 4A premiered February 18, 2016, with Vikings Season 4B to premiere November 30, 2016. On March 17, 2016, History renewed Vikings for Season 5.