Lingering evidence of Unlocking on Shop PBS
Go to Google, www.google.com, type in "Unlocking the Mystery of Life," and see what pops up on the right hand side of the listing that comes up. It has a "Shop PBS Online" link. So apparently PBS pays Google to have this sponsored link.
But when you click on the sponsored link, it goes to a page at PBS that says: "This product is temporarily out of stock." Funny.