Why is mathematics - a language developed through reasoning - so effective when it comes to describing the empirical world? Could either of the following have anything to do with this phenomenon: - the brains that conduct and observe the empirical experiments are naturally the same type of brains that develop the mathematics: human. - the empirical world is somehow bound, on a metaphysical plane, to function based on mathematical principles. I would also like to raise another question, which I have touched upon in previous posts, but would like to discuss in more general terms. Is mathematics a good tool when it comes to describing biological systems, or are they too complex to fit into the models? Any thoughts, links or other references are much appreciated! All the best, Anders.