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instaGrok is an educational (re)search engine that lets students (and anyone else) research any topic in an engaging, visual way. instaGrok finds the best information on the topic and presents it as interactive concept map ("grok"), showing key facts, concepts and relationships, videos, images, and more. Users can pin their favorite materials to their grok and take notes in the built-in journals.
This app lets you research any topic with an interactive concept map that you can customize and share. Customize, save, and share concept maps. The iPad app is free for students, but teachers must pay $45/year after a free 30-day trial.