This keynote presentation was delivered by Ecsite Honorary Member Pr. Per-Edvin Persson at the Asia Pacific Network of Science and Technology Centres conference in May 2014. Persson conducted an extensive literature survey on the impact of science centres and their activities. He lists facts and figures from a wealth of sources that show beyond doubt that science centres enhance learning, enhance local prosperity and contribute to social development. A handy resource for anyone looking for robust evidence to prove value and impact.