Has anyone in the past used the PBS Learning Media GoogleEarth activity about Marco Polo, Ibn Batuta, and Zheng He? It is no longer working for me... it's "glitching" and doesn't allow the user to make their way through the whole "voyage" for each World Traveler. I think Google is allowing past activities they created for GoogleEarth "sunset" naturally without trying to update/maintain them. Has anyone "saved" this activity in a different way or have a good alternative? Thanks!