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Uploaded on Apr 8, 2009
It's all about planetary attraction, magnetic that is. A compass can help you learn where north and south might be, as long as the planet you're on has some churning molten metal someplace. Maybe you'll find one, here or out in space. The pull is the strongest at the poles, and that's where the field is pulling straight down. So, that's where the air glows. Watch on...