Pope Francis made headlines around the world with his encyclical calling for action on climate change. In the U.S., that's put Republican presidential candidates on the defensive.
Rev. Clementa Pinckney was devoted to public service. He was a state senator and champion of civil rights. Those who knew him say he was a natural leader, whether in politics or in the church.
To stop elephant slaughter in Africa, zoologist Sam Wasser spent years extracting DNA from elephant dung and tissue. Much of the world's poached ivory, he discovered, comes from just three places.