In other lisps a let form has a body that the binding(s) range over and they are not available outside. As in `(let n 12 (+ n n))` here n wouldn't be accessible after. You have `(def name 5)` for making definitions that are readable outsude.
> The name "Steel Bank Common Lisp" is a reference to Carnegie Mellon University Common Lisp from which SBCL forked: Andrew Carnegie made his fortune in the steel industry and Andrew Mellon was a successful banker.
In The Black Swan, Nassim Nicholas Taleb argues that applying game theory to real life situations is one instance of the ludic fallacy. https://en.wikipedia.org/wiki/Ludic_fallacy
True, irrational shared a first hand experience and then proceeded to speculate as if that experience was evidence that smoking is more prevalent in Canada than in the US.