A small crumb like object feel in these slots, it is behind the black curving plastic where the bottom half with the keyboard meets with the screen when the laptop is open. I peered down behind the black curve or strip with a flashlight, & see it, but I cannot get to it. Will this cause problems? are those squarelike slots the vents? how is one supposed to clean or keep dust or other small objects that may inevitably fall down there? I have my laptop setup on a desk, & have been using an old sheet as a dustcover, I place it over the mac when it is not on/in use. I dont have much experience with mac hardware I have had mine since June 2010, this is my first mac computer, so a suggestion to take it apart sounds a bit too scary for me now & dont want to risk damage doing so.