No, they grew from experimental evidence. I'm not aware of any scientific knowledge that came from pure thought experiment without experimental validation. Pretty much the only thing you can use that for is maths.
You can say "but lots of discoveries came from medieval philosophers", but that's just because they didn't have a separate word for scientists. I'm using the modern definition of the word, which really makes my argument almost tautologically true. By the modern definition if any philosopher actually provided and answer to a question then people would call it science.