Answer:
Who eats a lot of iron without getting sick?
What can be forever wound up but never annoyed?
What does man love more than life, fear more than death or mortal strife. What the poor have, the rich require, and what contented men desire. What the miser spends, and the spendthrift saves. And all men carry to their graves.
Until I am measured I am not known, Yet how you miss me when I have flown.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?