Commentator Adam Frank argues that the bottom line on climate change is going to be our own economic bottom line. He says the economy will be the first place we are forced to really wake up to the true impact of climate change on our way of life.
The Earth rises behind the Apollo 11 lunar module during its return flight from the Moon's surface. The audacity of what can be done far way sometimes puts earthly challenges in perspective.
Astronaut Michael Collins/NASA
NASA's Curiosity rover will soon begin to search for signs of life, past or present, on the red planet. But can we make sense of life in strange places? And if we don't find it, what will it mean to us?
This artist concept shows NASA's Curiosity rover as it will look once it starts investigating the Martian surface for the ability to sustain microbial life — past or present.
Remarkable video footage of a killer whale nearly drowning her trainer underscores ongoing questions about SeaWorld's interspecies-encounter policies. Commentator Barbara J. King discusses the video in light of David Kirby's new book Death at SeaWorld.