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72% of the Earth's surface is covered by the water of the world's oceans, yet our attention is primarily focused on land. What do we (don't) know about the world ocean? Why should we be interested in seas and oceans other than when we want to go to the sea on vacation? Perhaps because 90% of international trade takes place by sea, and for an economy as open as ours, that is key. And it doesn't end there. Lecture by political geographer Michael Romancov Recording of lecture given in the Central Library of the Municipal Library in Prague 4/26/2022