Base units, their origin and meaning

Where base units come from and how they are related to each other? The second, the metre and other base units are useful approximations for describing our universe. What we measure are mere ratios among measured values and base units. The fundamental question is how...

The origin and limits of mathematics

It is difficult to accurately describe real circumstances in nature or technology. We can certainly determine general equations, see thermodynamics, with an accuracy of tens of percent. The rest can be fine-tuned ‘by trial and error’ based on estimates, experience,...