The polar vortex sweeping the country is producing some rather lovely photos. Here are a few of our favorites.
The odd relationship between the warming Arctic and extreme cold weather.
Weather isn’t climate, people.
The celebrity activist isn’t just against fracking; he wants to turn the conversation to green solutions.
Planetary scientist Carolyn Porco on the Cassini spacecraft, the possibility of life on Saturn’s moons, and seeing Earth from distant space.