“…Recently, experiments have accessed the particle mobilities in the limit corresponding to R ≲ R g , and have observed a number of intriguing noncontinuum characteristics. For instance, nanoparticle mobilities in polymer solutions (and melts) have been found to be much larger than expected from the SE limit, and have been observed to depend on four different length scales: R , R g , the polymer solution correlation length ξ , and the entanglement length or tube diameter d T . Moreover, in some cases, the time dependent displacements of the particles have exhibited unusually long regimes of sub‐diffusive behaviors …”