https://www.xataka.com/magnet/1938-dos-cientificos-se-encerraron-cueva-objetivo-crear-dias-28-horas-1
- April 4, 2024
Anyone who saw Professor Nathaniel Kleitman and his assistant, graduate student Bruce Richardson, descending into Mammoth Cave on June 4, 1938, would think they were part of a geological expedition or the