- ... that the Jagiellonian tapestries (example pictured) became state property of the Polish–Lithuanian Commonwealth by the testament of King Sigismund II Augustus?
- ... that the Tenczyn Castle was captured and pillaged because of a rumor that the Polish Crown Jewels were hidden in its walls?
- ... that there are several explanations of Frédéric Chopin's illness?
- ... that geneticist Piotr Słonimski joined with colleagues to organize support for scientists repressed during 1982–1983, the time of martial law in Poland?