  In this Letter, we explore dynamics in a three-dimensional strongly
interacting liquid. In quantum liquids discussed below, thermodynamic
properties such as pressure and thermal energies are fully characterized by
$s(T)$, the entropy density of the liquid (that is also directly proportional
to the hydrodynamic viscosity). We obtain a universal fermion spectral function
$A(\omega, {\bf k})$ that is distinctly specified by $\hbar / T$, a Planckian
time scale. These phenomena can emerge in strongly interacting many-body states
with a finite fermion density $\rho$ at temperatures $T^*$ where the chemical
potential of fermions $\mu(\rho, T=T^*)$ approaches zero and can be thought as
many-body simulations of certain aspects of Planckian dynamics.
