The 2026 Joint Annual Conference of Physical Societies in the Guangdong-Hong Kong-Macao Greater Bay Area (YGA 2026) was held at The University of Hong Kong. Qisi chaired the scattering session and gave an invited talk entitled “Magnetic fingerprints of high-T_c nickelate superconductors.” He presented our recent X-ray and neutron scattering studies of infinite-layer and Ruddlesden-Popper nickelates and discussed their relationship to cuprate superconductors.