Your discussion on the mysteries of B meson particles refers to the 'B factories' where these are being studied (Nature 546, 185–186; 2017). Aside from CERN's Large Hadron Collider (LHCb) in Geneva, Switzerland, and Belle at Japan's High Energy Accelerator Research Organization in Tsukuba, you should have mentioned the BaBar Collaboration at the SLAC National Accelerator Laboratory in California (go.nature.com/2ubp28p).

The BaBar Collaboration reported the first hint of new fundamental particle physics (see J. P. Lees et al. Phys. Rev. Lett. 109, 101802; 2012). It found a 3.4-sigma deviation from the expectations of the standard model of fundamental particles and their interactions. Subsequent measurements published in 2015 by LHCb and by Belle in 2015–17 confirmed the BaBar result. With these additional data, together with a new 2017 measurement from LHCb, the significance of the deviation from the standard model has grown to 4-sigma.