Special section editorial: The frontiers of augmented and mixed reality in all levels of education

As a result of the COVID-19 pandemic, the globe has seen the worst disruption of education systems in history, with schools and colleges having to shut and the number of students affected globally having increased dramatically. More than 190 nations, all continents, and over 1.6 billion learners have been impacted by the ongoing COVID-19 pandemic. More than half of the world's students are negatively affected by school closures, with 98% of lower-middle and lower-income nations bearing the brunt (United Nations, 2020 ).