Re: apply function incongruity

`and` and `or` are special syntax, so that they can do "short-circuit 
boolean evaluation", in order.

This only burps once:

#lang racket
(define (f) (display "burp!\n") #false)
(and (f) (f) (f))

This is useful when you have side-effects, and and for avoiding 
unnecessary computation.

You'll sometimes see `and` and `or` used more like a control structure 
from some other language, like `if`.

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