The most interesting notion is that of using complexity, a dimensionless metric that can be measured from within, instead of entropy, which can only be estimate

The most interesting notion is that of using complexity, a dimensionless metric that can be measured from within, instead of entropy, which can only be estimated from within, can only be measured from without. Since our universe doesn't have a "without", we can estimate entropy. But we can measure complexity, as it used in this article. Intriguing. Reformulating the Laws of Thermodynamics could make for a promising avenue of research.