Figure 1: Researchers have explored properties of turbulence in two important situations: (Left) A layer of fluid of thickness $d$ under the influence of gravity $g$ is heated from below, so that the temperature $T_b$ is higher than the temperature $T_t$ at the top (Rayleigh-Bénard case). When the temperature difference is sufficiently large, a transition from the state of pure heat conduction to a state of convection occurs. He et al.’s experiment [1] focuses on the asymptotic state of highly turbulent convection. (Right) In a Taylor-Couette system, a fluid fills the gap between coaxial cylinders with radii $r_i$ and $r_o$, $d=r_o-r_i$, which rotate independently with the angular velocities ${\mathrm{\Omega }}_i$ and ${\mathrm{\Omega }}_o$, respectively. At high enough rotation differential, ${\mathrm{\Omega }}_i-{\mathrm{\Omega }}_o>0$, a transition from the purely cylindrical flow to axially symmetric Taylor vortices occurs. The latter become turbulent at much higher values of ${\mathrm{\Omega }}_i-{\mathrm{\Omega }}_o$, which is the regime investigated in Huisman et al.’s experiment [2].