Learn about Helen Keller with this video clip, printable biosketch reader, and support materials. Xavier Riddle and the Secret Museum is a PBS KIDS show based on the popular book series, "Ordinary People Change the World," by Brad Meltzer and Christopher Eliopoulos. The show follows the adventures of Xavier Riddle, his sister Yadina, and their friend Brad as they travel back in time to meet real life historical figures when they were kids. Support materials are provided. [2:33]