(IMAGE) Spanish National Research Council (CSIC) Caption A city park in Pretoria, South Africa. / Thulani P. Makhalanyane Credit Thulani P. Makhalanyane Usage Restrictions Attribution is required. License Original content 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.