Who are your favorite historical heroes?  Jackie Joyner Kersee?  Anna Pavlova? Martin Luther King? Helen Keller?  Amelia Earhart? Imagine being able to travel back in time with your children to meet real-life inspirational figures when they were kids.  You can with the PBS KIDS show, Xavier Riddle and the Secret Museum on WILL-TV and anytime on-line at PBS KIDS.