Answer:
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
What I am filled, I can point the way. When I am empty. Nothing moves me. I have two skins. One without and one within.
Twigs and spheres and poles and plates. Join and bind to reason make.
The weapon of choice to create the biggest shock.
What word starts with 'E', ends with 'E', but only has one letter? It is not the letter 'E'.
What scientists might call your pooch.
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?