Deleting cards is usually only reserved when its info is either included in another card or the card’s content is proven to be irrelevant for the MCAT’s purposes. Links are usually included to Khan Academy videos if someone would like to look into the context of the material more, although we wouldn’t usually add links to studies to corroborate that the card’s content is true. Our process of revising suggestions is used to cover the validity of cards. For now, I will close this suggestion but feel free to let me know if I’m not interpreting your rationale correct. I’m happy to discuss it further and have a re-submission with an updated rationale if so