# Scale

## Day 4

Scaling theory enables simulations at a fraction of the cost and effort of building the real thing.

Scale invariance represent relationships within a system that don’t change regardless of scale or measuring system. These invariances enable the expression of scale as a mathematical formula.

Despite many systems having accurate mathematical representations, these formulas often because uselessly complex. Instead of calculating the solution outright, solving these problems require modeling or simulations.

It’s unlikely that there are “Universal Laws of Biology,” but it is likely that there are formulas that provide quantitative understanding of biological systems. For example, we may never have the ability to calculate how long you will live, but we might figure out how to calculate the maximum age you could live.