How do green screens work?

How do green screens work? The resulting images can look incredibly realistic -- so how do they make the magic happen? We'll tell you the secret.

What is the difference between Blu-ray and DVD?

They're both round. Both shiny. And they're the same size. Despite how they look, however, Blu-rays and DVDs are different kinds of technology. Here's a primer on the differences between the two spinning silv...

Amanda Tapping finds Sanctuary

In our Amanda Tapping interview, find about her experiences on Stargate SG-1, Stargate Atlantis and Sanctuary sci-fi TV shows!