A series of documentary films showing the lives and achievements of Polish scientists and inventors who operated in the first half of the 20th century. Their inventions or research contributed to the development of civilization in the fields of science, engineering and medicine. A hand-held film camera, a bulletproof vest, the basics of microprocessor production, blood group determination, walkie-talkies and color photography are just a few examples of discoveries and inventions that benefit the whole world.—G