To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S2. The solution under S ∼ 3.0 slowly crystallizes (taking more than 20 s) into a stable KDP crystal with a tetragonal structure, which we refer to as crystal II. 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 »