Although I knew little about the subject, I found myself enthralled by Professor Richard Evans' talk on Germany losing the Second World War.
Over the hour, Professor Evans detailed Hitler's plans for the world, including the transformation of Berlin into the "World Capital", and the complete domination of Europe and the East. He explained that it was all too evident that Germany's aims were overreaching; the very fact that its plans were limitless ensured that they would never be fulfilled. At the same time this one country was facing insurmountable odds from the combined forces of the British Empire, America and Russia. This led to a fascinating dissection of how it was near impossible for the Germans to have won.
The talk was intelligent, concise and - speaking as someone who doesn'tt know a great deal about the details of this particular aspect of the War- utterly absorbing.