Cze�� wszystkim, I've put a rough draft of the first lecture here:
http://www.wikipedia.org/w/wiki.phtml?title=Shape_of_the_universe
but I have to catch the bus now..
Staszek: you'll see the answer to the Twin Paradox stuff in the arXiv reference at the bottom of the page.
Please write a wikipedia entry (Polish or English) so that non-specialists can follow this too....
pozd boud