The paper by S.O. Valenzuela and M. Tinkham reports on the direct electronic measurement of the spin Hall effect in a diffusive metallic conductor, specifically aluminum. The authors use a ferromagnetic electrode and a tunnel barrier to inject a spin-polarized current, which, due to the spin-orbit coupling, induces a spin Hall voltage. This voltage is proportional to the component of the injected spins perpendicular to the plane defined by the spin current direction and the voltage probes. The experiments demonstrate that the spin Hall effect can be detected without the need for magnetic materials, offering potential for efficient spin detection and integration into spintronic devices. The study also characterizes the spin polarization, spin relaxation length, and spin Hall conductivity of the aluminum sample, providing insights into the spin dynamics in diffusive metals.The paper by S.O. Valenzuela and M. Tinkham reports on the direct electronic measurement of the spin Hall effect in a diffusive metallic conductor, specifically aluminum. The authors use a ferromagnetic electrode and a tunnel barrier to inject a spin-polarized current, which, due to the spin-orbit coupling, induces a spin Hall voltage. This voltage is proportional to the component of the injected spins perpendicular to the plane defined by the spin current direction and the voltage probes. The experiments demonstrate that the spin Hall effect can be detected without the need for magnetic materials, offering potential for efficient spin detection and integration into spintronic devices. The study also characterizes the spin polarization, spin relaxation length, and spin Hall conductivity of the aluminum sample, providing insights into the spin dynamics in diffusive metals.