There was an expert on WW II as a lecturer. My husband was really looking forward to his lectures. Unfortunately, this WW II expert was a terrible speaker. His lectures were real “sleepers.” He pretty much read his lectures to his audience. Passengers complained that he read to them from his PowerPoint presentation...they were all able to read what was on the screen and didn’t need the presenter to read it to them! Some people have the knowledge of a subject but not the ability to present it in an entertaining manner to an audience. I really would like to see HAL invest more $$ in better speakers, especially for the World Cruise.