On August 23, 1769, French naturalist and zoologist Jean Léopold Nicolas Frédéric Cuvier aka Georges Cuvier was born. He was a major figure in natural sciences research in the early 19th century, and was instrumental in establishing the fields of comparative anatomy and paleontology through his work in comparing living animals with fossils.
On May 2nd, 1601 (or 1602), German Jesuit scholar Athanasius Kircher was born. He has published most notably in the fields of oriental studies, geology, and medicine, and has been compared to Leonardo da Vinci for his enormous range of interests. He is regarded as one of the founders of Egyptology for his (mostly fruitless) efforts in deciphering Egyptian hieroglyphs, wrote an encyclopedia about China, studied volcanos and fossils, was one of the very first to observe microbes thorough a microscope, and experimented with the laterna magica as a predecessor of photography.