According to Karl Popper, what is the key difference between science and disciplines such as theology or philosophy?

Philosophers observe and learn about the natural world. Scientists only do
experiments.

Philosophers and theologians make conclusions about ideas using logic, history,
and other intellectual tools. Scientists base their conclusions on the results of
experiments and planned observations that test predictions derived from the
hypothesis.

Philosophers and theologians spend a great deal of time discussing, criticizing,
and writing about ideas. Scientists don't bother with discussion and writing.

Philosophers and theologians debate the logic of different ideas. Scientists do
not debate ideas.