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  1. According to some, gravity is not a "force" at all and it is the curvature of spacetime that causes objects to necessarily follow non-euclidean paths toward the center of the earth. We've all seen the "cannon ball on a rubber sheet" analogy to "explain" this. Problem there is, it presupposes a "force" of gravity, it seems. Why else would the cannon ball "sink into" the rubber sheet, thereby creating a depression which unsuspecting objects are forced to fall into, then follow? Without a force of gravity, why would they even "fall in" to begin with? According to this "ask a physicist" web
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