5/30/1423 Georg Peurbach, astronomer, advocate of Arabic numerals, most people were using Roman numerals. He used the numerals to advance a table of sines. He insisted on the solid reality of the crystalline spheres of planets. He was the teacher of Regiomontanus. He died in 1461 at age 37.
5/30/1797 Karl Naumann, German geology professor and minerologist, he died in 1873 at age 76.
5/30/1874 Ernest Dushesne, discovered that mold kills bacteria 32 years before Alexander Fleming but his research went unnoticed. He was only 23 years old and unknown. Army service prevented him from continuing his work. He died in 1912 at the age of 38.