Particles such as the proton can be imagined as vibrating strings. We also know that protons contain smaller, point-like particles, going against the string theory. But in five dimensions, the contradiction disappears.
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Maldacena, J. Into the fifth dimension. Nature 423, 695–696 (2003). https://doi.org/10.1038/423695a
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DOI: https://doi.org/10.1038/423695a
