Hi all, I've just got my first Mac; a retina MacBook pro! I have to say, coming from being a windows-only user, it astonishingly intuitive to use and has an outstanding build quality. But there's one issue; when using the small UK travel adapter, rather than the power-brick's usual lead, I've noticed that it hasn't got any connection between the metal pin of the power-brick and the Earth pin of the travel adapter; unlike the lead which has a visible metal piece which links with the power-brick. This causes the MacBook, only when I use the non-grounded travel adapter, to have a 'static feel' when I touch the metal case. I was wondering what is causing this static build-up, and why apple wouldn't connect the travel adaptor to the Earth; I'm assuming it's not dangerous in any way. Thanks!