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. John Tyndall:  His initial scientific fame arose in the 1850s from his study of diamagnetism.
his study of diamagnetism