Nina Shen Rastogi

The HBO fantasy drama Game of Thrones is ending its third season Sunday night, but many fans are still talking about last week's episode. That's when several beloved characters were killed off. 

A few weeks ago, Rebecca Black was just another 13 year old California middle schooler. In the last few weeks, she's become an internet sensation with her music video "Friday." Chances are you're one of the 38 million who have viewed the song on YouTube - if not, take a peek below. Slate.com contributor  Nina Shen Rastogi joins us to explain the story behind the song - and the subsequent backlash.

Nina Shen Rastogi, writer of Slate’s environmental issues column The Green Lantern, discusses her latest story on why we use salt to combat snow and how it affects the environment.