The lenses, tested

Fourteen so-called secret codes, run against the same real decision with a control. Seven earned their place. Seven did nothing.

Read this bit first. The version with no lens at all was nearly as good, in every round. These are worth using, but none of them is the lever. What changed the answer every single time was giving it my real numbers, my real situation, and what I was actually trying to do. Use the lenses on top of that, never instead of it.