Image 1 (IMAGE) Nanyang Technological University Caption Dr Keri Matwick, a linguist from NTU’s School of Humanities, posing with a key advertisement of the “Keep Singapore Clean” campaign. Credit NTU Singapore Usage Restrictions No restrictions. License Public Domain 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.