This is the biggest cemetery for Jews, Poles, Roma and Sinti. It must tell us that we have to come back here again and again. We must keep the memory of the worst crime in human history alive for those who were born later.
My favorite programming languages are Lisp and C. However, since around 1992 I have worked mainly on free software activism, which means I am too busy to do much programming. Around 2008 I stopped doing programming projects.