Gravitational force between two objects is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them. At the centre of the Earth, you are surrounded by equal amount of masses on all sides, so in fact, the gravitational forces being exerted on your body would all cancel each other out, making you effectively weightless. (I think...)
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"The weak are food for the strong, so die and let me feast!" - Makoto Shishio (RK)
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