Hi, just bought a new 2012 MBA, my first Mac ever, and I'm absolutely loving it. The trackpad is especially amazing. However, I've just found something...strange. It seems that the trackpad doesn't work best with my thumbs. Here's an example: let's say we use the two finger scrolling function. If I'm using any combo of 2 of my 4 longer fingers, it's easy to scroll and move around. It works even if the two fingers are very far away, and angled in strange positions. But if I'm using my thumb + any of the other longer fingers, most of the time the trackpad will ignore my thumb, unless my thumb and the other finger are very close together (it always works if they're touching each other). Pinching works fine though. A little more testing with it reveals that 3 longer fingers works great at dragging/choosing stuff, while 2 longer fingers + thumb almost end in scrolling. Ok, I'm not complaining at all - what I'm fascinated is how can it recognize that what's touching it is the thumb or not? I mean aren't all fingers the same skin and have the same capacitance? Anyone can put some input in this? Thanks.