To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S1. When the supersaturation S of the levitated KDP solution approaches S ∼ 4.1, the droplet rapidly solidifies as fast as within 1 s, which we refer to as a crystal I, a metastable KDP crystal with a monoclinic structure. Multiple pathways of crystal nucleation in an extremely supersaturated aqueous potassium dihydrogen phosphate (KDP) solution droplet Sooheyong Lee, Haeng Sub Wi, Wonhyuk Jo, Yong Chan Cho, Hyun Hwi Lee, Se-Young Jeong, Yong-Il Kim, and Geun Woo Lee PNAS. 2016. 113:13618-13623 DOI: 10.1073/pnas.1604938113 Download Original Video Browse All Videos »