If a man carried my burden He would break his back. I am not rich, But leave silver in my track. What am I?
My life can be measured in hours, I serve by being devoured. Thin, I am quick Fat, I am slow Wind is my foe. What am I?
To unravel me You need a simple key, No key that was made By locksmith's hand, But a key that only I Will understand. What am I?