Answer:
They come in many varieties: Red, Black, Dead, and Caspian to name a few.
If you have me, you want to tell me. If you tell me, you don't have me.
What word do all dictionaries spell wrong?
What can be measured but has no length, width or height?
What's always coming, but never arrives?
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.