In the blink of an eye, a fire can fell a forest. With the push of a button, a city can be razed to the ground. There’s little limit, it seems, to the speed at which an environment can change.

Hello, NOVA fans! We understand that many of you may be spending more quality time at home than usual. And, as schools across the country close and remain closed, fostering student learning at home is ...

(Program not available for streaming.) We humans have long wondered how animals see the world—and us. Does your dog really feel shame when it gives you that famous "guilty look?" What is behind the ...