Core Viewpoint - The article commemorates the 136th anniversary of Li Siguang's birth, highlighting his significant contributions to geology and national defense in China [1]. Group 1 - Li Siguang overcame numerous obstacles and traveled through multiple countries for over three months to return to China [1]. - He established the theory of geomechanics, which helped China shed its "oil-poor" label [1]. - His work laid a solid foundation for the development of China's "two bombs" (nuclear weapons) [1].