Short, entertaining stories about little-known people and events, with a science emphasis. Each OH comes equipped with story, links, and curated "Rabbit Hole" searches that lead the reader through scholarly articles, books, news and images. Rabbit Hole Searches are always refreshed. The Online Resources link will reveal vetted references on topical themes, plus videos, graphics, timelines, podcasts with academics, and more. More OH stories will be added to the mobile app as they become available.