Nonetheless, verification of weak scale SUSY (WSS, SUSY with superpartner masses at or around the weak scale as characterized by m (W, Z, h) ≈ 100 GeV) requires the direct observation of at least some of the superpartners in sufficiently energetic colliding beam experiments. As recent as 2017, the CERN Large Hadron Collider, a p–p collider operating at centre-of-mass energy 13 TeV, has not found any evidence for superpartners. This has led to mass limits on the gluino m ~ g > 2 TeV and on the lighter top squark m ~ t 1 > 1 TeV (within the context of certain simplified models that are assumed to make the experimental analysis more tractable). Along with these limits, the rather large measured value of m h ≈ 125 GeV seems to require TeV-scale highly mixed top squarks. These combined measurements have raised concern now about an emerging Little Hierarchy problem characterized by m W,Z,h ≪ m sparticle. Under the Little Hierarchy, one might expect the now log-divergent light Higgs mass to blow up to the sparticle mass scale unless one fine-tunes. The Little Hierarchy problem has led to concern that WSS is perhaps not realized in nature, or at least not in the manner typically expected by theorists in years past.