Answer:
Without what would everyone lose their head?
Humans have two that shrink in the light and expand in the dark
What occurs four times in every week, twice in every month, only once in a year but never in a day?
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
Cycle Cycle Cycle.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?