Broad Institute researchers optimized 10 polygenic risk scores for 10 common diseases, including heart disease, breast cancer, and type 2 diabetes, aiming to predict disease risk before symptoms appear. The study, published in *Nature Medicine*, focused on diverse populations and found that about 20% of participants had high risk for at least one of the diseases. The research highlights the potential for polygenic risk scores to be used in preventive medicine and clinical practice, though challenges remain in their application across diverse ancestries.