Title text:
When Galileo dropped two weights from the Leaning Tower of Pisa, they put him in the history books. But when I do it, I get 'detained by security' for 'injuring several tourists.'
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3154/
Poincaré? (I know, his insight somehow still came short of Einstein's, but it's interesting how close he came.)