Logging more steps per day as a systematic approach to health has an intuitive appeal, especially in light of the obesity epidemic in the United States.

moderate-to-vigorous physical activity

The results confirm that while the conventional wisdom needs an upgrade, logging daily steps can be a practical tool in the fight against obesity.

the conclusion symbol, a list of facts, and a list of rules

prove? must explain -- in situations where the goal is provable -- how the conclusion was reached.

returning T or NIL

For larger equations, use double dollar signs!

debug: (define (isprime n) (if (<= n 1) #f ) (for-each (lambda (n)) (equal? '(% n x) 0))) (isprime 4)

(foreach ((number '(1 2 3 4 5)) (letter '(a b c d e))) (display (list number letter)) (newline))