The South African Journal of Science is a multidisciplinary science journal published bimonthly by the Academy of Science of South Africa. Our mandate is to publish original research with an interdisciplinary or regional focus and to provide a forum for discussion of news and developments in research and higher education. About the cover: Baobab trees. In an article in this issue, Kotzé identifies characteristic solar periodicities from carbon isotope data of 1000-year-old baobab trees. Other articles in this issue explore the following: COVID-19: Perspectives from the humanities and social sciences | Potential global warming impact of wood-based residential building in South Africa | Identification of solar periodicities in southern African baobab δ13C record | Aerobiology in South Africa and the launch of SAPNET.