Just a thought to leave NS on a friday night.
Let us suppose there were a hole straight through the earth. (IE here central america to wherever it would be on the other side) Then let us suppose there isnt any soft of molten lava center, and all that jazz.
Now what would happen if you fell through that hole, presumably to the other side. At what point would you begin to "fall" up? (obviously the center of the earth, i think?) but what would happen? Also would you be able to tell?? would you fall feet first and then fall up feet first? would you get a head rush? what???
make it happen NS!