CURIOSITYVILLE: Houghton Mifflin Harcourt is on a roll. Today HMH said it had snapped up Maryland-based Curiosityville. Details of the acquisition were not made public. Curiosityville was launched in June 2012 by Susan Magsamen, a writer and advisor on learning, creativity and family engagement, Curiosityville aims to give families and educators resources to help children, ages 3 to 8 years old, build resiliency and strong physical, social-emotional, and academic skills at an early age. It has leaned heavily on evidence-based research on how children learn and is aligned with Common Core Standards.