To Mask or Not to Mask: Science Fair 2021

My son did his science fair project on the CO2 load one takes in from Masking. He didn't want me to record...but we sneakily did so and he was happy we did. I have had several people ask me to share his research. I will up load pictures and the report once I figure out how too :). Remember this was done by a thirteen year old boy! So be kind if you comment! Thank you!