D. Xing, X. Gao, H. Chen, J. Zhang, M. E. Edwards, C. Liang, C. Zhu, Y. Meng, R. N. Zare, Y. Xia, and X. Zhang, “Challenges in Detecting Hydroxyl Radicals Generated in Water Droplets with Mass Spectrometry,” Anal. Chem. 97, 7995–8000 (2025).