https://www.sciencemag.org/news/2021/05/can-diet-and-exercise-lower-your-risk-dementia-rigorous-clinical-trials-aim-find-out?utm_campaign=news_daily_2021-05-27&et_rid=40170360&et_cid=3788733 Cultivating hope The controversial approval of an Alzheimer’s drug reignites the battle over the underlying cause of the disease