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Structure of spacetime at the microscopic scale.
** **...We know nothing about the structure of spacetime at the microscopic scale. We simply assume it is a continuum (in technical terms, a differentiable manifold). We also assume that at every point the topology of space is hyperspherical. Yet, when we push spacetime to its limits, we encounter two barriers: the Planck length, 10⁻³³ cm, and the Planck time, 10⁻⁴³ seconds. Beyond these, nothing makes sense anymore.
...We can imagine all possible microscopic textures. Take, for example, a 3D space. We can divide it into two disjoint domains using the surface described below.
...You can construct it using flexible Bristol board strips measuring 10 cm by 1 cm, and a stapler. With this material