The paper by Subir Sachdev and Jinwu Ye explores the spin-S quantum Heisenberg magnet with Gaussian-random, infinite-range exchange interactions. The authors access the quantum-disordered phase by generalizing to $SU(M)$ symmetry and studying the large $M$ limit. For large $S$, the ground state is a spin-glass, while for small $S$, it transitions to a spin-fluid state. The spin-fluid phase is found to be gapless, with the average zero-temperature local dynamic spin susceptibility obeying a specific form at low frequencies. The study introduces a new solvable model and discusses the properties of the spin-fluid phase, including the zero-temperature phase transition to the spin-glass phase. The authors also present numerical results and discuss the implications of their findings for dynamic neutron scattering experiments on random antiferromagnets.The paper by Subir Sachdev and Jinwu Ye explores the spin-S quantum Heisenberg magnet with Gaussian-random, infinite-range exchange interactions. The authors access the quantum-disordered phase by generalizing to $SU(M)$ symmetry and studying the large $M$ limit. For large $S$, the ground state is a spin-glass, while for small $S$, it transitions to a spin-fluid state. The spin-fluid phase is found to be gapless, with the average zero-temperature local dynamic spin susceptibility obeying a specific form at low frequencies. The study introduces a new solvable model and discusses the properties of the spin-fluid phase, including the zero-temperature phase transition to the spin-glass phase. The authors also present numerical results and discuss the implications of their findings for dynamic neutron scattering experiments on random antiferromagnets.