News that a famous Galileo manuscript at the University of Michigan Ann Arbor was revealed to be a fake raises questions about a similar letter that appeared on GBH’s Antiques Roadshow in 2014. Did the show get it wrong? And how can a fake be so convincing it fools multiple experts? Host Adam Monahan, joined by forgery-sniffing historian Nick Wilding, dig into a world of deception to uncover if the producers are in for a letdown.