Penni Rubin is a Renaissance woman--an educator, a working artist, a children's author, a playwright, a musician, and a photographer. Among her many published books is "What's Under Your Feet?," a Earth Science book written for the U.S. Geological Survey. She is also a popular workshop presenter, especially for teachers where she shares 40 years of experience in developing creative, interactive learning centers for pre-K through 4th grade. She has written and produced many songs. In fact, this latest book began as a song. When she added her sunset photos to the song, she knew it would be a popular book. "Why is the Sky Blue?" answers the question all children ask with science and stunning photographs of clouds and sunsets.