Ernst Gräfenberg Ernst Gräfenberg Ernst Gräfenberg (September 26, 1881 in Adelebsen near Göttingen, Germany – 28 October 1957 in New York City, United States) was a German-born physician (medical doctor) and scientist. He is known for developing the intrauterine device (IUD), and for his studies of the role of the woman's urethra in orgasm. The G-spot is named after him. Gräfenberg studied medicine in Göttingen and Munich, earning his doctorate on 10 March 1905. He began working as a doctor of ophthalmology at the university of Würzburg, but then moved to the Department of Obstetrics and Gynaecology at the University of Kiel,
Ernst Evald Bergroth Even as a young student, Bergroth was interested in natural history, and joined the "" in 1875. In 1877, he took part in a research expedition up the Yenisei River to Siberia. He specialised in the craneflies of the family Tipulidae and bugs of the suborder Heteroptera, and published more than 300 papers in his lifetime. He was fluent in many languages, and wrote in German, Latin, English, French, Swedish and Italian. Ernst Evald Bergroth Ernst Evald Bergroth (April 1, 1857 – November 22, 1925) was a Finnish physician and amateur entomologist. Bergroth was born on April 1, 1857 in