Jimmy Kimmel

Celebrity political activity has been quite common for a long time. But with an atypical entertainer in the White House, we're seeing something different today.

• By Seth Masket

The results are misleading, and tell us more about our own insecurities than they do Obama's popularity.

• By Gregory Ferenstein

Observations from a day spent watching the “8 Mile” pack in Yellowstone with crowds of tourists from an environmental scientist who should know better.

• By Diana Liverman