02:32Science In Action2021: The year of variantsBBC World Service Duration: 27 minutes Fri 31st Dec 2021, 02:32 on BBC World Service East AsiaAvailable for over a yearListen nowThe year began with Alpha, and ends with Omicron. What have we learnt? Show more GenresFactualScience & NatureFormatsMagazines & ReviewsBrandScience In Action Source: BBC Online