aA year and a half after the coronavirus pandemic, the Sars-CoV-2 virus still remains an important puzzle to scientists. Of course, research regiments have been able to draw many conclusions from their countless studies, the most important and significant victory is undoubtedly the development of effective vaccines in record time. Yet many questions that citizens and politicians rightly ask themselves have so far received only vague answers.

Against this background, the Science Media Center in Cologne asked more than 40 scientists studying the coronavirus what they thought was a question in urgent need of an answer. Although this is not a representative survey, these subjective responses allow us to produce an interesting mapping of the unknown.