I spent my last weekend in Brussels at FOSDEM. Well, not really: while I had a couple of Belgian beers, the conference itself was a virtual event and I was at home in Budapest. It’s the second year that FOSDEM is virtual, and yet again I can state that it’s the best virtual event of the year. I had two talks this year. After my second talk, I got some questions during the Q & A session which I could not answer, so I will try to answer them.