Mining near Mammoth dates to late 1800s. By William Ascarza For the Arizona Daily Star Jan 10, 2016 Jan 10, 2016 Updated Feb 26, 2016; 1 of 2 ...

Why we explore Mars—and what decades of missions have revealed. In the 1960s, humans set out to discover what the red planet has to teach us. Now, NASA is hoping to land the first humans on Mars ...