A packed house at New York University’s Skirball Center was in attendance for a reading of Alan Alda’s play “Dear Albert” on May 28, the first day of the 2014 World Science Festival. The work, drawing from the personal letters of Einstein (Paul Rudd), his first wife, Mileva Maric (Cynthia Nixon) and other figures in their lives (Francesca Faridany, who also narrates). It’s a humanizing, funny, and at times troubling peek at the heart of the man whom most of us know as just a metonymy for genius with fright-wig hair.