Meet our new pet, a blue whale named Per. Did I have you going there for a second? Okay. It’s not a real pet, but my kids don’t know that. I don’t think. Well, my 9-year-old kind of knows, but she likes to believe, so I’m not going to ruin the fun. A few months ago, in a riveting blog post, I told you about an amazing TED talk I listened to by author Mac Barnett and the children’s book I bought as a result, Billy Twitters and His Blue Whale Problem. I think I mentioned in that previous post there’s a fun surprise under the jacket cover of that book. My kids…