Environmental Molecular Sciences Laboratory’s new web feature presents an article entitled “Aloft, Some Mysteries of Complex Chemistry”. This article focuses on atmospheric aerosol research collaborations between EMSL user Alexander Laskin, EMSL chemist Swarup China, and numerous U.S. national laboratory, academic, and industry researchers. In a sweeping look at studies published over the past five years, this articles discusses projects investigating the chemistry and composition of biological aerosol particles.