Final answer:
The question seems to refer to the contributions of John Wheeler in the field of theoretical physics and general relativity, particularly involving his popularization of the term 'black hole'. For specifics on Wheeler and Jacobson's findings, additional context is needed.
Step-by-step explanation:
The question 'What did Wheeler and Jacobson find?' likely refers to the pioneering work of John Wheeler. He was a prominent figure in the field of theoretical physics and made significant contributions to general relativity theory.
However, without specifying who Jacobson is and the context of their joint work, it is impossible to give an accurate answer.
We can mention that John Wheeler popularized the term black hole and had substantial impact on physics, but as for the findings with Jacobson, more information is needed to provide an accurate response.