Scientific American, November 2013

In this issue:

"King of Beasts": What happened to all of the large carnivore species that used to roam Africa?

"World with Two Suns": Astronomers are discovering distant planets that orbit two-star systems, uncovering bizarre and wondrous worlds unlike anything in our solar system.

"Hacking Drones": Drones’ security flaws allow them to be readily hijacked with simple technology.

"The One-Stop Carbon Solution": An ingenious plan that involves burying carbon while providing fuel for electricity.