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The Smithsonian Institution is the world's largest museum, education, and research complex. We are a community of learning and an opener of doors. Join us on a voyage of discovery. Legal: https://www.si.edu/termsofuse

The Encyclopaedia Britannica Group is a global knowledge leader whose flagship products—from Encyclopaedia Britannica®, Britannica® Digital Learning, Britannica Knowledge Systems®, Merriam-Webster®, and Melingo®—inspire curiosity and joy of learning on multiple platforms and devices. Encyclopaedia Britannica, founded in Edinburgh, Scotland in 1768, marks its 250th anniversary this year. A pioneer in digital learning since the 1980s, the company today serves the needs of students, lifelong learners, and professionals by providing curriculum products, language-study courses, digital encyclopedias, and professional readiness training through its extensive products.