45 years ago today, the first IBM PC, one of the early personal computers, was released. (1851)139 years ago today, Erwin Schrödinger, the father of quantum mechanics, was born in Austria. Schrödinger is one of several individuals who have been called “the father of quantum mechanics”. (1887)36 years ago today, the most complete and best-preserved skeleton of a Tyrannosaurus rex ever found was uncovered in South Dakota. WATCH a 5-minute history of the band… (1968)And, Happy 77th Birthday to Mark Knopfler, the British singer-songwriter, guitarist, and co-founder of Dire Straits.