African Americans are more likely than whites to develop Alzheimer’s. Why? – The Washington Post
https://www.washingtonpost.com/lifestyle/magazine/why-are-african-americans-so-much-more-likely-than-whites-to-develop-alzheimers/2017/05/31/9bfbcccc-3132-11e7-8674-437ddb6e813e_story.html?utm_term=.08ca91ce1f6e