Answer:
When a doctor hits you with a hammer he is testing this
Though I should be unique, you've made most of us the same. I would be stronger, if my characters were stranger.
What word becomes smaller when you add 2 letters to it?
The distance from the top of your head to the floor standing up straight.
I occur twice in eternity. And I'm always within sight.
I will disappear every time you say my name.
Easy
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?