Bubonic plague and Newton's best two years
How Newton developed his hallmark work in the period of two years during bubonic plague.
Theory of ideas
There is a real of Ideas, the deepest reality, which is eternal and unchanging, and provides source of all we can name or speak of. And it builds upon Pythagoras. we come into close contact with the world of eternal, perfect Ideas when we deal in mathematics concepts like numbers, or Platonic solids.
First principle truths
Self-evident truths from which all other knowledge is derived. These are the most basic truths that cannot be deduced from any other proposition. And since they are self-evident, they do not require further proof.
Metaphysics
You cannot disprove this. There is no physical experiment or logical proof that can distinguish between a universe that is billions of years old and one created five days ago