The National Institute on Environmental Sciences and National Institute of Aging have funded a new Telomere Measurement Network. In 2020, 2021 and 2022, we will support up to five projects that address scientific gaps in relation to telomere length as it applies to epidemiological research.  The projects can include secondary analyses of large samples (>300) that examine novel questions about the relation between TL and health and/or TL and exposure.