In this article, Science contributor Jyoti Madhusoodanan discusses the experiences and sufferings that have had life-long impacts on Vietnamese surviving the wars of the 1960s and 1970s. The article highlights research based on the Vietnam Health and Aging Study (VHAS), a large project led by Drs. Zachary Zimmer at Mount Saint Vincent University, his close collaborator, Dr. Kim Korinek of the University of Utah, and an international team of scholars.  VHAS research is funded by both the National Institute on Aging in the U.S. and the Canadian Institute of Health Research. https://rb.gy/l2opda