The Tyndall crater was named after John Tyndall, what was John Tyndall famous for?
Tyndall (Martian crater) Tyndall is an impact crater in the Cebrenia quadrangle of Mars, located at 40.0°N latitude and 190.1°W longitude. It measures approximately 87 kilometers in diameter and was named after Irish physicist John Tyndall (1820–1893). The name was approved in 1973, by the International Astronomical Union (IAU) Working Group for Planetary System Nomenclature.
John Harvey Kellogg John Harvey Kellogg, M.D. (February 26, 1852 – December 14, 1943) was an American medical doctor, nutritionist, inventor, health activist, and businessman. He was the director of the Battle Creek Sanitarium in Battle Creek, Michigan. The sanitarium was founded by members of the Seventh-Day Adventist Church. It combined aspects of a European spa, a hydrotherapy institution, a hospital and a high-class hotel. Kellogg treated both the rich and famous and the poor who could not go to other hospitals.