User language
pl-N Polski jest językiem ojczystym tego użytkownika.
en-2 This user has intermediate knowledge of English.
ru-1 Этот участник владеет русским языком на начальном уровне.
la-1 Hic usor simplici lingua Latina conferre potest.
de-0 Dieser Benutzer beherrscht Deutsch nicht (oder versteht es nur mit beträchtlichen Schwierigkeiten).
fr-0 Cet utilisateur n’a aucune connaissance en français (ou le comprend avec de grandes difficultés).
Wikipedia Administrator.svgThis user is an administrator on the Polish Wikipedia (verify·CA).
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My name is Wojtek, I live in Józefów (suburbs of Warsaw, Poland). I’m an active editor in Polish Wikipedia since September 2009 and an administrator since 2012. I studied Chemistry (Explosives and Pyrotechnics) at the Military Technological University in Warsaw and I usually edit chemistry-related articles.

I had access to the Physical Sciences Elsevier's collection thanks to The Wikipedia Library.