Learn how far coughs, sneezes, and vomit travel, in this episode of Gross Science from NOVA. Scientists can use technology to track the liquids that fly out of noses and mouths and study how far germs can travel. Researchers at MIT used high-speed cameras to reveal that the droplets in a cough or sneeze travel in an invisible gas cloud, which can carry germs much farther than people previously thought. Researchers use robots to simulate the act of puking to study the spread of norovirus. One episode of projectile vomiting can contaminate close to 84 square feet, and virus particles can also be suspended in the air. This research reveals that germs are easily spread and may linger in places that appear to be clean. This resource is part of the NOVA: Gross Science Collection.