How to Significantly Slow Coronavirus? #Masks4All (Creative Commons license, feel free to share)

This video is under Creative Commons license, feel free to share it (please always mention the link to the original YouTube version). Here is the source data of the video for download: EDIT: We have added a new and urgent message from the Minister of Health of the Czech Republic for other health ministers and governments: Please, share and help us to save lives around the world. A KEY ARGUMENT FOR USING HOMEMADE MASKS: Homemade masks ar