Schematic diagram to illustrate the evolution of Weyl fermions in YbPtBi, as the temperature is reduced and the Kondo interaction becomes stronger. The dramatic decrease of the Fermi velocity v* at low temperatures leads to the disappearance of the chiral anomaly contribution c_a, but the large entropy associated with the renormalized bands leads to a sizeable cubic term in the temperature dependence of the specific heat C_e. Meanwhile a sizeable topological Hall effect contribution ρxyT can be detected in both the low and intermediate temperature ranges, arising from the Berry curvature generated by the Weyl points. Figure reproduced from Guo et al., Ref. [32].