Okay Maciamo, I have the following suggestions of Polish contributions:
(choose the ones which you like the most and add them into a poll):
- Distillation of crude oil (Ignacy Łukasiewicz, Jan Zeh)
- Typhus vaccine (Rudolf Stefan Weigl)
- Windscreen wiper (
Józef Hoffmann)
- Heliocentric theory (Copernicus)
- Bulletproof vest (Kazimierz Żegleń, Jan Szczepanik)
- Mine detector / metal detector (Józef Kosacki)
- Building rockets (Kazimierz Siemienowicz)
- New constellations (Hevelius)
- Trans-Andean Railway (Malinowski)
- The relief of Vienna in 1683 (Sobieski)
- Torpedo launchers on submarines (Drzewiecki)
- Theoretical description of buckling of a compression bar (Jasiński)
- Liquefaction of gases (Olszewki, Wróblewski)
- Long span bridges in the USA (Modrzejewski)
- Material stress theory (Huber)
- Radioactivity research (Skłodowska)
- The discovery of vitamins (Kazimierz Funk)
- Hydroelectric power plants in Switzerland (Narutowicz)
- Polish mathematical theories (Banach, etc.)
- Hydrogen bomb (Ulam)
- Polish-Soviet War 1920 (Piłsudski)
- Overthrowing Communism in Eastern Europe
- Czochralski method (Jan Czochralski)
- Pleograph (Kazimierz Prószyński)
- Polish classical music (Chopin, Ogiński, Kurpiński, Moniuszko, Wieniawski, Paderewski, Karłowicz, etc.)
- Polish modern music (Lutosławski, Komeda, Kilar, Górecki, Penderecki, Dębski, Preisner, Lorenc, etc.)
- Polish sci fi and fantasy books (Stanisław Lem, Andrzej Sapkowski, etc.)