Part 1 Planet of Man -- Beyond a doubt - revolution 9-Part1
Tuzo Wilson
•Ideas of revolution and the changes of the epic of man
• Reasoning -- Plato, Ptolemy
• End of the 15th century, Copernicus absolute motion everything revolves in circular motion
•16th century Kepler discovers mars orbit is elliptical not round orbit. Breaking a 2000 year old thinking.

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Today, continental theory is superseded by plate tectonics.
Continental drift treated only the continents as jigsaw puzzle whereas plate tectonics treats the continents, oceans and the earth's crust as pieces of jigsaw puzzle.
These segments are a flashback to part of the development of the current theory