The Science Center in Differdange (photo LaLa La Photo) has been running online interactive quizzes that are now available in English.
The Science Center’s website currently has three different quizzes online--one about colours, one about Luxembourg-related population statistics, and one about polymers. More quizzes are available in French. The quizzes are multiple choice and questions range in difficulty. Take them here.
The website also has a page dedicated to some mythbusters about coronavirus.