With Dr. Jeffrey Bennett (University of Colorado)2015 marked the 100th anniversary of Einstein's completion of his General Theory of Relativity, the comprehensive theory of space, time, and gravity. In everyday language, Dr. Bennett explains the basic ideas of Einstein's work (both his special and general theories) and shows how Einstein's remarkable ideas are being confirmed today by a range of astronomical observations.  He concludes with four reasons why relativity should matter to everyone.  (Recorded in 2015)Dr. Jeffrey Bennett is the lead author of one the most popular introductory astronomy textbooks, and has written a number of books for children as well as for teachers. He is considered one of the leading educators in the field of astronomy.