Do observations lead to a sudden idea or to a theory?

This observation led to the development of the first vaccine.

The observation that trust is always required between market participants later led to credit money.

The observation led him to wonder whether it could be used as a vaccine.

This, I think almost every one has experience of in himself, and his own observation without difficulty leads him thus far.

Such observations led him to alert the federal government of his findings.

His observations led him far beyond the accepted remedies of that day.

Lorenz's own observations led him to take a different view.

This observation led to the research and development of the mere-exposure effect.

"What did these two observations lead you to believe?"