Some of the best & brightest Germans had Slavic or Jewish roots.
Leibniz was at least half Slavic Sorb one of the biggest German intellects, an inventor of Calculus & Binary Code, he also was a Philosopher, others include the physicist Theodor Kaluza had Polish ancestry, Paul Nipkow the first inventor of Television had Polish-Kashubian ancestry, Max Skladanowsky had Polish ancestry, and was the founder of German cinema, and movie projectors, Gregor Mendel had some Slavic Moravian ancestry, and was the founder of Genetic Inheritance, Schubert the German Classical composer had Slavic Czech ancestry too.
Werhner Von Braun who put a Man on the Moon was related to Polish king Mieszko, and his maternal Grandmother's name Von Gostkowski is of Polish origins.
Even Friedrich Nietzsche considered himself Polish, and thought Germans entered the talented nations from a strong mixture of Polish blood.
As for Jews, physicists like Einstein, Max Born, Otto Stern and Oppenheimer were Jews.
Jewish Siegfried Marcus invented the Gasoline Car.
Jewish Fritz Haber behind the Haber process.
Jewish psychologist Sigmund Freud.
The Jewish classical composer Mendelsohn.