High-speed imaging has enabled researchers to directly observe the mechanisms of droplet formation during sneezing. The study reveals that the break up of the fluid into droplets continues to occur outside of the respiratory tract during violent exhalations, involving a complex cascade of events from sheets to bag-bursts to ligaments and, finally, droplets. For violent sneezes, the break up into smaller droplets continues well outside of the nose, the team found. The work is important for controlling the spread of disease and challenges the common belief that respiratory droplets are formed prior to ejection.