Mike Wall/Space.com The space rock set to give Earth a historically close shave on Friday may be worth nearly $ 200 billion, prospective asteroid miners say. The 150-foot-wide (45 meters) asteroid 2012 DA14 — which will zoom within 17,200 miles...

Mongolia is arguably experiencing the biggest gold rush of the 21st century—yet  large swaths of its population remain extremely poor. Unemployed herdsmen are among those who have turned to gold mining in an effort to eke out...