Universities meet growing demand with Weed 101

Cat Packer will lay the legal foundation for how the United States' second-largest city handles marijuana. But it wasn't until three years ago that she even knew what she wanted to do professionally.

Why 420?

April 20, or 4/20, is known as "Weed Day" in some circles because the date corresponds with a numerical code for marijuana, CNN reported. But why does 420 represent smoking pot?