In the second part, I will discuss the resistivity rule, i.e., R_{xx} ~ B x dR_{xy}/dB. This empirical rule was observed twenty years ago. Yet, today we have only a relatively complex model that addresses the origin of this rule. What’s more interesting is that in the second LL, since R_{xy} switches back and forth between FQHE and IQHE values several times as the filling factor varies from ν =4 to ν = 2, this non-monotonic R_{xy} leads to regions of negative B x dR_{xy}/dB, which cannot find an equivalent in R_{xx}, a positive definite, thus apparently violating the empirical rule. However, in a more detailed examination, we found, surprisingly, a new resistivity rule in the second LL. The regular, positive parts of B x dR_{xy}/dB are well reflected in R_{xx}(+B), whereas the irregular negative going sections of B x dR_{xy}/dB closely match the inverted R_{xx}(-B) trace, where -B refers to the opposite magnetic field direction of +B. It is unclear whether our observations of an expanded resistivity rule reinforces or refutes the present model of its origin.