Topological Kondo insulator possesses characteristics of both the strong electron correlations and the topological configurations, as shown in a mixed-valence material SmB₆. YbB₆ is a structural analog of SmB₆, but remains controversial whether compressed YbB₆ material is a topological insulator or a Kondo topological insulator. A research team used HPCAT facility and performed x-ray measurements on YbB₆samples. Both the high-pressure powder x-ray diffraction and optical Raman measurements show no trace of structural phase transitions in YbB₆ up to 50 GPa. The x-ray absorption measurements reveal a gradual change of Yb valence from nonmagnetic Yb²⁺ to magnetic Yb³⁺above 18 GPa concomitantly with the increase in resistivity. A complete transition to insulating state occurs at pressures above 30 GPa, accompanied by an increase in the shear stress and anomalies in the pressure dependence of the Raman T_2g mode and in the B atomic position. The resistivity at high pressures can be described by a model taking into account coexisting insulating and metallic channels with the activation energy for the insulating channel about 30 meV. These results indicate that YbB6 may become a topological Kondo insulator at high pressures above 35 GPa. More in J. Ying et al., Phys Rev. B, 97, 121101(R), 2018.