Sparticl is a new web and mobile service for teens, a collection of the very best the web has to offer in science, technology, engineering, and math or STEM. Sparticl includes answers to science questions, images, videos, games, and hands-on activities, all curated by a team of experts. But it's also a place where teens play a critical part – ranking content, sharing it, and recommending new content, all the while earning points and badges. Sparticl is created by the award-winning National Productions division of Twin Cities Public Television, and is made possible with the generous support of 3M.
From the site - "Digital Collections is the National Library of Medicine's free online archive of biomedical books and videos. All of the content in Digital Collections is freely available worldwide and, unless otherwise indicated, in the public domain. Digital Collections provides unique access to NLM's rich, historical resources."