 BOSTON, March 15, 2021 PRNewswire -- Learning technology company Houghton Mifflin Harcourt today announced the availability of HMH Into Science K-5, a Next Generation Science Standards NGSS-aligned core curriculum that is the latest addition to HMHs suite of award-winning Into Learning core programs. This digital-first program allows for seamless learning within varied learning environments and incorporates multimedia components and digitally enhanced interactivity to deepen engagement. 