Before the first human boot sinks into Martian dust, an army of machines will have already been at work for years, testing ...

Behind every "I'm fine" and forced smile lies a silent battle that millions of men fight daily, mastering the art of ...

This is a follow-up to a story that appears in the June 2018 issue of National Geographic magazine. On a fall morning in 1937, an Emory University geologist was walking down a hallway in the alumni ...