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Lucid is your visual guide to the world's most important knowledge. - Master essential topics in psychology, philosophy, history, finance, leadership, business, health, science, technology and more. - Understand complex concepts quickly, with elegant visuals that clarify key ideas and help you stay focused. - Take challenging daily quizzes that help you retain what you've learned. - Save and review the insights and visuals that matter most to you. - Complete a chapter in two minutes or less, in bite-sized sessions throughout your day.  Lucid offers an auto-renewing yearly subscription and an auto-renewing monthly subscription which allows you full access to all of the content in our catalog for as long as you maintain an active subscription.  Payment will be charged to the credit card connected to your iTunes account at the time of initial subscription purchase.  You can manage your subscription and auto-renewal can be turned off by going to your Account Settings after the purchase.  Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period.  Your account will be charged for renewal within 24 hours prior to the end of the current period end date, and the cost of the renewal will be listed.  Pricing in other countries may vary and actual charges may be converted to your local currency depending on your country.  These prices are for United States customers.  Learn visually!