Science is what we know: Philosophy is what we don't know:
That's nothing but a slogan, Paddoboy. Why do you insist on thoughtlessly repeating it? You probably should stop and think about it.
Historically, the word 'philosophy' was basically synonymous with 'scholarship'. All areas of scholarly inquiry were included within the range of philosophy.
The natural world was definitely included as an object of scholarship, and 'natural philosophy' was a thriving specialty area of philosophy. The early experimenters thought of themselves as natural philosophers and were perceived as such by those around them.
The word 'science' derives from the Latin 'scientia', meaning 'knowledge'. By the 1400's it had come to mean 'skill', 'handicraft' or 'trade', hence people spoke of the 'science of cooking'. In the 1600's, we see the word 'science' being used to indicate non-arts subjects in the university curriculum.
Even today, a few European universities still refer to what we think of as 'science' as 'natural philosophy'
In the 17th century, natural philosophy underwent an explosion of interest, as new mathematical and experimental techniques were applied by its practitioners with dramatic results. Today we call those events the 'Scientific Revolution'.
As a result, natural philosophy acquired a host of new specialist practitioners, along with new professional organizations like the Royal Society. And as natural philosophy became institutionalized and professionalized, and as universities acquired dedicated science departments and programs, the word 'science' was gradually co-opted to refer to natural philosophy. This happened rather late, in the 18th and 19th centuries.
So where does that leave the distinction between science and philosophy today? In the English-speaking world at least, the word 'philosophy' has come to mean the examination of the most basic assumptions and principles underlying any area of behavior or inquiry.
Seeing as how 'science' began its career as the Latin word for 'knowledge',
epistemology (the philosophy of knowledge) is obviously relevant.
Epistemology inquires into questions associated with the different objects of knowledge (the external world, the past, the future, values, abstractions, minds) and supposed sources of knowledge (perception, memory, reason, introspection, intuition, ESP), along with the relationship of knowledge to certainty, doubt, justification, evidence, belief, causation and revisability.
Contemporary proponents of scientism are very fond of thinking that they are the rational ones, the practitioners of logic. So
philosophical logic is obviously relevant too.
Regarding deductive logic, the philosophy of logic inquires into the relationship between formal logic and informal reasoning in natural language. It also investigates problems associated with meaning, truth, implication, and many more technical topics like modality, deontology, tense, model theory and set theory.
Consideration of inductive logic introduces problems involving probability, confirmation and the logic of explanation.
These issues bring us to the
philosophy of science proper.
The philosophy of science investigates what science's aims are (explanation, truth, simplicity, coherence, prediction, practical use), how science changes over time, how different sciences are related (reducibility), questions about the methods science employs (induction, hypothetico-deductive method, confirmation, falsification, observation and experiment, measurement and taxonomy) and what science presupposes or tells us about the nature of reality itself (realism/ instrumentalism, status of theoretical entities, quantum/classical issues, nature of physical law, uniformity of nature, the relation of mathematics and logic to physical reality, how causation should be conceived, and issues regarding space and time).
Now let's look at Paddoboy's slogan again: "Science is what we know: Philosophy is what we don't know".
My claim is that his slogan doesn't correspond to how the words 'science' and 'philosophy' have historically been used. Nor does it explain how someone could possibly practice science, let alone hold the kind of views that Paddoboy does himself about things like "scientific method", without making lots of unacknowledged assumptions about what the answers are to these kind of questions.
The fact is that scientists are constantly philosophizing, even if they are doing it unconsciously. Paddoboy is doing so himself.
I think that it's always best to be aware of the assumptions that one is making, and if possible, to be able to provide some justification for them.