The youtube video has links to various ones in the description. But you have to follow the posts to get to the actual research. Here are some: https://www.atsj

The youtube video has links to various ones in the description. But you have to follow the posts to get to the actual research. Here are some: https://www.atsjournals.org/doi/full/10.1164/rccm.200202-138BC https://www.atsjournals.org/doi/full/10.1164/rccm.200202-138... https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2362.2007.01845.x https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2362.... https://www.researchgate.net/publication/343237144_Role_of_Nitric_Oxide_in_the_Paranasal_Sinuses_-_Demystifying_the_Aerocrine_Organ https://www.researchgate.net/publication/343237144_Role_of_N... https://www.atsjournals.org/doi/full/10.1164/rccm.200202-138BC https://www.atsjournals.org/doi/full/10.1164/rccm.200202-138... ... When you try doing it, you start noticing a strong smell that smells like early spring or the smell certain air purifiers make. This smell lasts as long as you keep humming.