Ultracold atomic gases offer a powerful platform for exploring many-body physics, providing nearly isolated environments with well-characterized Hamiltonians, tunable dissipation, and dynamically controllable dimensionality. In this talk, I will discuss two paradigmatic strongly interacting cold atom systems: the unitary Fermi gas and the one-dimensional Bose gas. A dilute, two-component Fermi gas tuned to a broad Feshbach resonance represents the most strongly interacting nonrelativistic system known. At resonance, the system becomes a unitary Fermi gas, characterized by universal thermodynamic and transport properties that are independent of microscopic details. These gases are remarkably stable, enabling precision tests of nonperturbative many-body theories relevant to systems ranging from high-temperature superconductors to neutron stars. I will present our recent measurements of transport properties of a unitary Fermi gas confined within an optical box potential. In parallel, one-dimensional Bose gases serve as an ideal platform for testing dynamical theories due to their experimental accessibility and high degree of control. I will briefly highlight our recent work testing generalized hydrodynamics (GHD), a novel framework that simulates the dynamics of nearly integrable systems by tracking the distribution of quasiparticle rapidities. I will also outline ongoing experiments aimed at probing regimes with reduced integrability.