Alzheimer’s disease, a chronic and irreversible neurodegenerative disorder, is spreading across the globe at an unprecedented pace. Today, more than 50 million people suffer from it. What’s even more alarming: women are nearly twice as likely as men to develop the disease. In the past, many believed this was simply because women live longer, and advanced age naturally increases risk. But scientists have now found that the story is far more complex. Experts from Harvard, Yale, the Chinese Academy of Sciences, the U.S. National Institutes of Health, and other top research institutions have spent years uncovering deeper answers: dramatic hormonal fluctuations, unique expression of sex chromosomes, and the heavy workload of women’s brain networks. Together, these three mechanisms quietly push women into the high-risk zone for Alzheimer’s. Why is it that women’s brains—often smarter, more nuanced, and more efficient—are paradoxically more prone to “collapse”? The answers are shocking, and thought-provoking.