This article in the Daily Mail is really interesting. It presents information that certainly explains the restrictions on liquids. But, I am still curious - why 100ml? Why not ban all liquids? Sure there are liquids that people will clearly need to have with them (medicines and such) which would merit permission even with the risk, but it seems that for everything else, 1L spread over a couple of bombers in a bunch of 100ml containers would accomplish the same level of destruction.