Hello All. This is driving me crazy and nobody can give me a straight answer, if there is one. I was daydreaming in my yard last week and came up with a weird question. Lets say I discovered a hole in my yard. The hole is plenty wide and well-constructed and has a series of rungs I can easily climb down. This hole actually goes straight down, through the exact center of the Earth, and pops out the other side. I climb down the rungs into the hole. Now lets ignore all factors such as heat/pressure/breathable air/etc. and lets focus on gravity. At some point the direction of gravity would have to shift, right? And that would occur at the exact mid-point, right? But does gravity increase or decrease as I go further down and what, exactly, happens at the center -- do I find myself suddenly flipped around and climbing the rungs or would there be a point where gravity is "neutral" and I would be floating? Or would the "epi-center" of the gravity shift be so tiny as to render such a question meaningless? Please help my twisted mind resolve this. Thanks!