Mayim Bialik, the “Blossom” actress, knew exactly where to throw the New York launch party for her new parenting book, “Beyond the Sling.” The 36-year-old mother of two, who has a Ph.D. in neuroscience, quickly settled on the appropriately named Cafe Blossom on the Upper West Side for her book fete Thursday night. Bialik, who stars in the sitcom “The Big Bang Theory,” lives in Los Angeles but has fond memories of New York, where she filmed her breakthrough role in “Beaches,” playing the young Bette Midler. “I remember filming at Coney Island. I got my first Nathan’s hot dog,” Bialik says. “I remember we stayed at the Essex House and rehearsed in Garry Marshall’s hotel room.”