Barbie dolls, credit cards and the keys of modern pianos are commonly made of what material?

Which broadcaster co-hosted ABC's "20/20" with Barbara Walters for many years? Barbara Walters started as a writer on which NBC morning show in 1961 and eventually became its first female co-host? Racehorses Barbaro and Seattle Slew and the zebra all belong to which genus? Frederick Barbarossa led an army in which Crusade, which began in 1189 and lasted until 1192? Barbie's boyfriend celebrated his 40th birthday in March 2001. What is his name? Barbra Streisand plays a psychiatrist in which 1991 film, which she also directed and co-produced? Barbra Streisand's 1971 album title revealed her middle name. What is it? Barbra Streisand's first non-singing film role was in which 1970 adaptation of a Bill Manhoff play?