1\. Interdisciplinary  The element named after this country is generally considered to be the heaviest metalloid, and this country's Prime Minister for much of 1919 was a world famous pianist. Despite the claims by some Germans, it also is generally considered the home nation of astronomer Nicolaus Copernicus. This nation signed a treaty in 1990 agreeing that its border is the Oder-Neisse Line, and its invasion by Germany
1\. Interdisciplinary  The element named after this country is generally considered to be the heaviest metalloid, and this country's Prime Minister for much of 1919 was a world famous pianist. Despite the claims by some Germans, it also is generally considered the home nation of astronomer Nicolaus Copernicus. This nation signed a treaty in 1990 agreeing that its border is the Oder-Neisse Line, and its invasion by Germany at the beginning of September 1939 is often marked as the beginning of World War Two. Name this nation once led by Lech Walesa whose capital is Warsaw.
1\. Interdisciplinary  The element named after this country is generally considered to be the heaviest metalloid, and this country's Prime Minister for much of 1919 was a world famous pianist.
Poland