This is just to complement some older threads on the topic. The strand model, a conjecture that appears to describe both the standard model and general relativity, has been published. The DOI is http://dx.doi.org/10.1134/S1063779619030055 and the reference is Physics of Particles and Nuclei, vol. 50 (2019) pages 259-299. The conjecture predicts the lack of effects beyond the standard model. It describes particles as rational tangles.