Answer:
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
I let water fall on you while everyone else stays dry.
I am black when you buy me red when you use me when I turn white you know itβs time to throw me away.
I am an odd number that become even when beheaded.
Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers magazines and journals.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.