How did wegner stummble upon the matching continents that formed pangaea?

Alfred Wegener was looking at maps once, (as he was a weatherman) and found the edges of each continents fit together like a puzzle. He researched it, and then came up with the theory of Continental Drift. The people did not accept his theory, and asked what made the continents move. He thought that that was not his problem, but the people of the world's problem.