> We can't even predict many of these subsystems with any degree of accuracy so we are hopelessly inaccurate at the higher level. Or do we? This sounds like a

> We can't even predict many of these subsystems with any degree of accuracy so we are hopelessly inaccurate at the higher level. Or do we? This sounds like a Fermi problem https://en.wikipedia.org/wiki/Fermi_problem#Explanation https://en.wikipedia.org/wiki/Fermi_problem#Explanation I may be wrong, though.