I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
I am a mountain at night, meadow at day. What am I?
Sometimes I fly as fast as the speed of light. Sometime I crawl as slow as a snail. Unknown until I am measured but you will certainly miss me when I’m gone.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
Though not a plant I have leaves. though not a beast I have spine. Though many wouldn't need me I am more valuable than wine.
Man's most important invention.