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@Black_Kettle @AstroKatie @MarkPaulson7 @ExpanseOnPrime For popular introductions: 1. https://t.co/vPAqKFlNCb 2. https://t.co/UYDOoJEn9U For more academic: 3. https://t.co/a1Hbw0iPlK 4. https://t.co/HAO45RrYHb 5. https://t.co/Oqp7ClIqfY