Physicists have been struggling for nearly a century to bend and twist the so-called "standard model" to include room for gravitational force (and presumably a particle to carry it), but so far to no avail. The recent failures of string theory have left another candidate in the ditch. Electric and magnetic forces have been unified, and they in turn were unified with the strong and weak nuclear forces…why is quantum gravity so hard? Perhaps because it is not a force like the others. Perhaps gravitation is only a property of the dynamics of aggregates for which there is no micro-level phenomenon corresponding to it. Perhaps gravitational behavior emerges from the forces acting at the micro-level instead of being one itself.

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