"Rain Man" was just a movie . . ."Born on a Blue Day" is the real-life memoir of Danel Tammet, a man with the rare form of Asperger's disease known as "Savant Syndrome." He can learn a new language in a week and perform extraodinary mathematical calculations in his head. Though he has the all the odd tics and quirks of someone with Aspergers, he is able to live an independent life--and tell his unique personal story.