Composite Vulnerability in Africa (image) University of Texas at Austin, Texas Advanced Computing Center Share Print E-Mail Caption The composite picture highlights areas of chronic insecurity where the four sources of vulnerability coalesce. Credit Joshua Busby et al. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.