https://www.bankrate.com/investing/series-i-bond-for-college/#:~:text=Current%20yield%3A%20The%20Series%20I,the%20same%20year%20it%27s%20cashed.
https://www.thetaxadviser.com/issues/2022/sep/using-i-bonds-for-education-savings.html#:~:text=Interest%20earned%20on%20I%20bonds%20can%20be%20excluded%20from%20federal,at%20a%20postsecondary%20educational%20institution.