Weekly Science Blog (and Video) Roundup

• Ever wonder how Friday the 13th got its unlucky reputation? Here's a complete history of the date's roots. • When plants attack: Dot Earth interviews M. Night Shyamalan about The Happening. • In case eating cat litter and rolling in horse manure wasn't gross enough, your dog may just have a toad-licking addiction. • Back on the train: As gas prices skyrocket, the government steps in to help give travelers an Amtrak alternative. • Are these baked goods meant to cause cancer, or cure them? • And for this Friday's afternoon video, here's security camera footage of one employee's epic rage against the cubicle (someone should seriously get this guy a plant):