Answer:
I am easy to waste and unstoppable
I am often sold by children entrepreneurs in summer time
I was not born but I am here. I have no name but I am given many. I was made by science and life
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
I hold two people together but touch only one. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.