I’m used every day, but I’m never kept forever. I work best when I’m sharp, yet I’m meant to become dull. I take something away, but I never steal.

A medical marvel derived from mold, Killing bacteria, but can't hurt a cold -- Take out its in, one L, and the first of its eyes, And you'll find me hidden inside. Still made from nature, but I'm quite dead; Indeed, you see, I'm all full of lead.

I travel the world but have no legs, I carry your words without any pegs. I can bring joy or deliver despair, And reach you quickly from anywhere.

I have no feet, yet help you roam, Through glassy lakes or rivers’ foam. I’m split in two, but still am whole, With steady strokes I guide your goal.

I travel the world but never take a step. I carry your secrets, both tidy and a mess. I'm packed full of plans, yet I make none myself.