Dr. Margareta Griesz-Brisson MD, PhD, a world-renowned neurologist from Germany, warned that face masks cause oxygen deprivation and permanent neurological damage, especially in the developing brains of children.
https://archive.org/details/Carbon-Dioxide-Face-Masks
This is the long version of a study published previously as a short research letter by JAMA Pediatrics. (Walach, H., Weikl, R., Prentice, J., Diemer, A., Traindl, H., Kappes, A., & Hockertz, S. (2021)
https://old.reddit.com/r/conspiracy/comments/l8dab9/multiple_studies_show_the_dangers_of_face_masks/
https://archive.org/download/hiv-aids-fauci-documentary/oxygen-deprivation-torture.pdf
You are the liar spreading the lie. Masks significantly lower oxygen levels. Why don't you want to get an oxygen sensor and objectively measure that simple fact by yourself? Are you so dumb that you can't take a multimeter and measure voltage between two pins of the sensor? OK, you could buy ready-to-use oxygen level meter and measure. You don't believe in electricity? Or may be you can't read digits from LCD? What is your problem, tell us please, we will try to help.