For this week's '20 Questions' series we talk to Staff Sgt. John Nunn who is taking a break from his cookie business to head to Rio to compete in the upcoming Olympics.
Facebook's mission statement may be 'move fast and break things,' but the CEO's strategy is thoughtful and consistent with his vision to connect the entire world.
A new study says the planet's water might not be drinkable. Worse, it might not even exist. A team of scientists from the University of Arizona looked more closely into those dark streaks called "recurrent slope linae" or RSL in an effort to figure out their origin.