Earlier this month, sophomore Keira Chang released her children’s science book, “Marinara and Alfredo: How Do Rainbows Work?”, which became a No. 1 bestseller on Amazon in the Environmental Science Books and Children’s Light & Sound Books categories. In the book, two young scientists (Marinara the mouse and Alfredo the monkey) learn about the mechanics of rainbows. The book’s success caught the attention of KTVU FOX 2, which featured Chang in a segment last week.