changes right now, let's take a look at how the stock market ended the week >>> you may know her as winnie cooper from the wonder years, but actress win mckeller is also an author and a mathematician. >> thank you so much for having me >> i knew you grew up acting you knew you loved math and knew you had written some books what i didn't realize is you graduated from ucla suma cum laude. what is the excellence atmath? >> the paper is not as relevant as the books that i am writing now. i took my love of mathematics. i just love the beauty of math and i took my love of entertainment and i intiecombind them into entertaining math books. i teach math with comics and cartoons because i believe math can be fun >> this book in particular helps kids and parents understand common core. can you help us briefly explain common core. >> there are so many parents saying i don't know how to help my first and second graders with their math homework. they all figure come middle school they might need some extra help but they figured they would have their 6-year-old's math under control. with common core, things ar