If you live in a neighborhood with lots of trees, your health can benefit. Researchers at the University of Louisville followed hundreds of people living in six low- to middle-income neighborhoods in South Louisville, Kentucky. They used blood and other samples to track how their heart risks changed before and after the team planted thousands of mature trees near their homes. The results were impressive. The residents had lower levels of a blood marker associated with heart disease, diabetes and some types of cancer compared with those who lived near less trees. Plant more trees for better health!