I copy/pasted the exact text of the comment you are responding to into Google--including the "Didn't we" and the question mark--and it pulled up the source you

I copy/pasted the exact text of the comment you are responding to into Google--including the "Didn't we" and the question mark--and it pulled up the source you couldn't find. https://www.economist.com/technology-quarterly/2023/09/25/what-the-young-can-give-to-the-old https://www.economist.com/technology-quarterly/2023/09/25/wh... > In 2020 Irina Conboy of the University of California, Berkeley, and her colleagues found that replacing half of an old mouse's blood with just albumin, a blood protein, and saline solution had the same rejuvenating effect as young-mouse blood. Old blood may need filtering and dilution, not supplementing. https://news.berkeley.edu/2020/06/15/diluting-blood-plasma-rejuvenates-tissue-reverses-aging-in-mice https://news.berkeley.edu/2020/06/15/diluting-blood-plasma-r...