Answer:
There are millions of me. I am very small but when moving fast I am deadly.
Vikings use this for warmth.
You throw away the outside and cook the inside. Then you eat the outside and throw away the inside. What did you eat?
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?