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We will see how the Emergent String Conjecture, together with general assumptions about the asymptotic structure of scalar potentials in string theory and experimental observations suggest that, if our universe is to sit close to a weakly coupled corner in the string landscape, there should be a single large extra dimension of roughly micrometer size. I will describe some possible experimental signatures of this scenario that might be testable in the near future. A failure to detect them would suggest that, if our Universe is described by a string theory vacuum, it is strongly coupled.