Note: Funding Information: This work was supported by the Development Project of Guangdong Academy of Sciences [grant number 2020GDASYL-20200102002]; and the National Natural Science Foundation of China [grant number 41801132, 42081330505]. The authors are grateful for all authors and reviewers who have contributed to the special issue. Many thanks to Professor Cecilia Tortajada, without whose continuous support this special issue would not have been possible.