Subscribe to Kurtis Baute! https://www.youtube.com/channel/UCTRM8LE1g6UXrVZKwgw5oEA or start with his one-take video on the history of the universe: https://www.youtube.com/watch?v=ObngtuPFI8A
Inside his homemade, hermetically-sealed, airtight biodome, Kurtis Baute is already out of breath and surrounded by more carbon dioxide than he should be. And that's going to affect a lot of things -- including how smart he is.
CO2 and Cognitive Function Scores: https://ehp.niehs.nih.gov/doi/pdf/10.1289/ehp.1510037
Indoor Air Quality and Academic Performance: https://www.gwern.net/docs/co2/2015-stafford.pdf