Recent work by Miguel Onorato et al. demonstrates a very interesting route to thermalization. Rewriting the FPUT model in terms of normal modes, the non-linear term expresses itself as a three-mode interaction (using the language of statistical mechanics, this could be called a "three- phonon interaction".) It is, however, not a resonant interaction, and is thus not able to spread energy from one mode to another; it can only generate the FPUT recurrence. The three-phonon interaction cannot thermalize the system.