A question for Mark Gaffney which occurs to me after listening to your article. (I listen using specialised software for those with no reading vision.)

Do you think that Earth itself wobbled four times, each time producing different pole positions, with the continents remaining more or less where they are? If it was just the crust displacing, how did the layout of, for instance, the British Isles remain the same and not rupture along the geological WSW - ENE line where two paates 'joined' to form the juntion between Scotland and England?

Please note that this is a simple, straightforward question! I have to add this, because there are those here who will warn you not to listen to me, the sceptic!

I look forward with interest to your reply.
Susan