Answer:
What comes in many different sizes but is always one foot long
How do you know if a tiger is male or female?
What has a tongue but no mouth?
How fast do librarians travel?
It is the time in your life when you simultaneously know everything and nothing at an instance.
People take me on walks and I run and have fun. What am I?
Funny
Animal
Difficult
Easy
Food
Kids
Logic
What am I?