Answer:
You heard me before, yet you hear me again, then I die. Until you call me again.
What can go through glass without breaking it?
I can be quick and then I'm deadly, I am a rock, shell and bone medley. If I was made into a man, I'd make people dream, I gather in my millions By ocean, sea and stream.
It is the electronic version of junk mail or a salty meat in a can.
What is round as a dishpan, deep as a tub, and still the oceans couldn't fill it up?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.