Answer:
When a doctor hits you with a hammer he is testing this
This is the main ingredient in spaghetti and Mac-N-Cheese.
What can be any size or shape and gets bigger the more you take from it?
Gumby and yoga instructors have this in common.
A twiggy home
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?