This week: A Broadway star tells us how he finished the New York Marathon and then performed in two shows back to back, a wife seeks advice on how best to shave her hairy companion, plus, are the lyrics to Bye Bye Birdie what we think they are? You can email your burning questions to howto@npr.org.How To Do Everything won't live in this feed forever. If you like what you hear, scoot on over to their very own feed and…