Robert Bunsen was born on this day in 1811, a German chemist he investigated emission spectra of heated elements. He discovered cesium and rubidium. He developed the Bunsen burner which are still used in laboratories today. He died in 1899 at the age of 88.
Also born on this day was Bernhard Schmidt, he invented the Schmidt telescope to correct distortion when trying to enlarge something while keeping the field enlarged at the same time, he died in 1955 at age 76.
Maimoides was born in 1135. He was the physician to Saladin, wrote a book called Guide for the perplexed, he died in 1204 at age 69.