Answer:
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
One simple click, one simple flash. A piece of memory, for years I'll last. What am I?
I stay where I am when I go off. What am I?
I have no weight but I could destroy a mansion. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic