> A good hypothesis results in the same experiment as its negative: "There are more supersymmetric particles at higher energies" is the same hypothesis as "Ther

> A good hypothesis results in the same experiment as its negative: "There are more supersymmetric particles at higher energies" is the same hypothesis as "There are not more supersymmetric particles at higher energies" because you test both hypotheses in the same way. Contrast this with a promise: you can't promise something and its opposite. Again, use the word promise here with its other meaning and it makes perfect sense. Both framed questions have the promise of revealing something big. They are not a guarantee of a big result but there is the possibility of a big result.