Title text:
The inflection point was probably in late 1966 or 1967, so when Neil Armstrong flew to space on Gemini 8, plate tectonics was not widely accepted, but when he landed on the Moon three years later it was the mainstream consensus.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3159/
I have to believe that as soon as there were accurate maps of South America's east coast and Africa's west coast, someone must have looked at them and said -- you know, I bet those two were joined at some point in the past.