  Probing dynamic and static correlation in glass-forming supercooled liquids
has been a challenge for decades in spite of extensive research. Dynamic
correlation which manifests itself as Dynamic Heterogeneity is ubiquitous in a
vast variety of systems starting from molecular glass-forming liquids, dense
colloidal systems to collections of cells. On the other hand, the mere concept
of static correlation in these dense disordered systems remain somewhat elusive
and its existence is still actively debated. We propose a novel method to
extract both dynamic and static correlations using rod-like particles as probe.
This method can be implemented in molecular glass-forming liquids in
experiments as well as in other soft matter systems including biologically
relevant systems. We also rationalize the observed log-normal like distribution
of rotational decorrelation time of elongated probe molecules in reported
experimental studies along with a proposal of a novel methodology to extract
dynamic and static correlation lengths in experiments.
