It is that time of the year to look back and reflect on our journey of the past 12 months and be hopeful about the next twelve. Despite all the hurdles we have faced, 2021 has been a big year for technology and innovation, ranging from the fastest development of vaccines in modern history, Mars landing and China's new space station to the advent of the metaverse. Yang Zhao from CGTN's Tech It Out Studio reviews the scientific and technological achievements that defined 2021.