Burke, William J.: Kristian Birkeland's MessageIn 2005 the Birkeland Lecture was included in a one day seminar organized as part of the celebration of Hydro's (and Yara's) 100 years anniversary. Apart from this anniversary, 2005 was also a special year since it was decreed as the World Year of Physics by the United Nations, and Kristian Birkeland was honored by the Norwegian Committee to represent Norwegian physics and the Norwegian physicists in this year. Hence the seminar was also a celebration