[Aquinasfan]

Science's Big Query: What Can We Know, and What Can't We?

This is the territory of philosophy, not natural science.

[Physicist]

This is the territory of philosophy, not natural science.

Not always. The Heisenberg Uncertainty Principle and black hole "no-hair" theorems come immediately to mind. Even the 2nd Law of Thermodynamics implies hard scientific limits on knowledge (i.e. the impossibility proofs of Maxwell's Daemon).

[RightWhale]

This is the territory of philosophy, not natural science.

Why do scientists earn a PhD, Doctor of Philosophy? One would think there is some philosophy involved along the way.