Brother and sister team CRISTINA and RICK SMITH have been solving puzzles together their whole lives. They are the award-winning authors of the Yoga for the Brain series of puzzle books. Learn more at www.YogafortheBrain.com. CRISTINA AND RICK SMITH are a brother-and-sister team and the award-winning authors of the Yoga for the Brain puzzle book series. They love doing jigsaw, word, and logic puzzles, and have been solving them together their whole lives.