{ 1 } - science describes the world, while philosophy proposes attitudes, feelings, and ways of living.
{ 2 } - science is what you know and philosophy is what you do not know.
{ 3 } - science is about what is empirically testable, while philosophy is about the analysis of concepts.
{ 4 } - there really is no difference.

Russell says that philosophy is that part of our beliefs which is speculative and uncertain, where we have opinions but no knowledge. The charm of philosophy, at least for many people, is that it lets us play with hypotheses -- it lets us create possibilities. Once an area gets settled and the results are proven, philosophers tend to lose interest -- and the area becomes part of "science."