Answer:
By myself, I'm practically nothing. Worthless as a leader, but when I follow a group, their strength increases tenfold. What am I?
I have a head and a tail but no body. What am I?
What is black when it's clean and white when it's dirty?
Drop me and the world will shatter. You can always find me where you empty your bladder.
What invention lets you look right through a wall?
What never gets any wetter no matter how hard it rains?