It turns out, tears are more essential than might have thought. This Moment of Science looks at the chemistry of tears.
What is the smallest fish? Find out on this Moment of Science.
From light saber battles to the sinking of the Titanic, some special effects seem almost magical. Most film makers still use a relatively simple process called matte layering, which involves using a blue or green screen to create images that can be layered to create a composite image.