Quote Originally Posted by pinkyslayer
if gravity holds us to the earth, and also gives us a sense of up and down, in a way, then why dont people in antarticta or other places below the equator experience a constant upside down sensation?
Exactly because it gives us the sense of up and down. For us, "down" is to where gravity attracts us to. So, the "down" is always towards the earth, no matter where we are at it.

Also, the north hemisphere only points upwards in the school maps. The earth is a sphere, and there is no absolute upwards or downwards in the space, so each point of the earth can be said to be pointing upwards, or downwards, or whatever, but its only matter of choice. The direction is relative, and depends only of the position of the observer.
For me, who am in the south hemisphere, im pointing upwards (cause the earth is below me) and everybody in the north hemisphere (most of you) are pointing downwards. So, its you who should be feeling upside down!