This week on Dear Science Marcus brings us some COVID-19 news as well as some info about a map of the universe.

Marcus explains how mass vaccinations can change how impactful COVID-19 is, doe to experiment being done in Brazil.

Marcus also talks about how suring lockdown air pollution decreased, however now with travel increasing again, it's all coming back.

Finally Marcus explains how a 3D map of the universe has been made, and what it means for research,