‘A Triangular Frustrated Eu(II)–Organic Framework for Sub-Kelvin Magnetic Refrigeration’ by Anna S. Manvell, Maja A. Dunstan, David Gracia, Jakub Hrubý, Mariusz Kubus, James N. McPherson, Elias Palacios, Høgni Weihe, Stephen Hill, Jürgen Schnack, Marco Evangelisti, Kasper S. Pedersen, Journal of the American Chemical Society (2025); https://doi.org/10.1021/jacs.4c17003 This work unveils a new design principle for dense magnetic