Answer:
A person who chews the ends of their fingers
A tiny bead, like fragile glass, strung along a cord of grass.
Soldiers fight it but never changes.
Hearing something unexpected or touching a live wire can have this effect.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.