The paper by S. Burger et al. reports on the experimental creation and dynamics of dark solitons in cigar-shaped Bose-Einstein condensates (BECs) of ${}^{87}$Rb atoms. Dark solitons, also known as "kink-states," are created using a phase imprinting method, where a local phase shift is applied to the BEC wavefunction. The dynamics of these solitons are observed by monitoring the evolution of the density profile. The density minima, which travel at velocities slower than the speed of sound in the condensate, are identified as moving dark solitons through comparison with analytical and numerical solutions of the 3D Gross-Pitaevskii equation. The experimental setup involves a highly anisotropic confining potential, leading to a strongly elongated shape of the condensate, which is favorable for the dynamic stability of dark solitons. The phase imprinting method involves applying a homogeneous potential generated by a far-detuned laser beam to one half of the condensate, creating a local phase shift. The evolution of the density profile over time reveals the formation and movement of dark solitons, with their velocities depending on the applied phase shift. Theoretical simulations of the 3D Gross-Pitaevskii equation support the experimental findings, showing that the creation of dark solitons is accompanied by a density wave moving in the opposite direction. The simulations also predict the behavior of dark solitons during the initial stages of evolution and the radial ballistic expansion of the condensate. The decrease in soliton contrast observed experimentally is attributed to dissipation, providing a signature of dissipative dynamics in the soliton system. The study of dark solitons in BECs opens new avenues for exploring nonlinear phenomena in dissipative environments, with potential applications in atomic physics and thermometry.The paper by S. Burger et al. reports on the experimental creation and dynamics of dark solitons in cigar-shaped Bose-Einstein condensates (BECs) of ${}^{87}$Rb atoms. Dark solitons, also known as "kink-states," are created using a phase imprinting method, where a local phase shift is applied to the BEC wavefunction. The dynamics of these solitons are observed by monitoring the evolution of the density profile. The density minima, which travel at velocities slower than the speed of sound in the condensate, are identified as moving dark solitons through comparison with analytical and numerical solutions of the 3D Gross-Pitaevskii equation. The experimental setup involves a highly anisotropic confining potential, leading to a strongly elongated shape of the condensate, which is favorable for the dynamic stability of dark solitons. The phase imprinting method involves applying a homogeneous potential generated by a far-detuned laser beam to one half of the condensate, creating a local phase shift. The evolution of the density profile over time reveals the formation and movement of dark solitons, with their velocities depending on the applied phase shift. Theoretical simulations of the 3D Gross-Pitaevskii equation support the experimental findings, showing that the creation of dark solitons is accompanied by a density wave moving in the opposite direction. The simulations also predict the behavior of dark solitons during the initial stages of evolution and the radial ballistic expansion of the condensate. The decrease in soliton contrast observed experimentally is attributed to dissipation, providing a signature of dissipative dynamics in the soliton system. The study of dark solitons in BECs opens new avenues for exploring nonlinear phenomena in dissipative environments, with potential applications in atomic physics and thermometry.