You need to be up to date on the subject that David Kalivas discusses in his World History podcast. With a lot of enthusiasm I made a second run of his series of lectures and while I enjoyed it, again, a lot, I was disappointed as well. You cannot take the series as a full blown educational podcast. After listening you will remain with too many fragments. If you need an introduction, or even an outline of World History, do not take on David Kalivas.
Although he is a very pleasant and entertaining lecturer, he goes off on tangents all the time. Consequently, the historic milestones are not all mentioned, or even put in order. Whatever he says is very worthwhile and I liked hearing his words, but they serve an entirely different purpose. They pick and choose on some aspects of World History and give some in depth reflections on them. This means that if you are on par with the discussed epoch, setting and events, his lecture can be very thrilling, but that is a lot of prerequisite to take into a podcast.