The 12th From Solid State to Biophysics conference was held in Cavtat, near Dubrovnik, Croatia, from 13 to 20 June 2026. Qisi gave an invited lecture entitled “X-ray scattering studies of magnetic and electronic structure of nickelate superconductors.” He presented our recent resonant X-ray scattering studies of infinite-layer and Ruddlesden-Popper nickelates, highlighting how their spin and orbital excitations reveal the strength of magnetic interactions and electron correlations and discussing their relationship to high-temperature superconductivity in the cuprates.