A balance (decision theory) and an urn containing colored balls, with a few balls drawn (Bayesian inference).
It's an extremely short notice, but we're going to have the first meeting tomorrow, that is - Saturday (2009-04-04) 14:00, in cafe on top of the Waterstones bookstore near the Piccadilly Circuis Tube station.
If you want to know more, email me (Tomasz.Wegrzanowski@gmail.com) for details. Or just come straight away.
Hopefully we can get it going, and the second meeting with be better organized.