The demonstrators, protesting nuclear arms, carried signs reading, "Humans have never invented a weapon that they
haven't used." Where is there a missing comma?
After humans
After weapon
There are no missing commas

I would say there are not missing commas. It wouldn’t make sense to add a comma after humans or after weapon.

Explanation:

it u understand what he thought at the time and let u know more about him then what third person would of known probably. hope this : )

one thousand and one nights, also known as arabian nights is a collection of stories whose basic structure is that of embedded narrative. this technique refers to a main story which works as the common frame - or framing narrative - for the other stories, and then this series of stories which are connected to the main one. this technique can also be referred to as a story within a story. the stories stem from the original tale, some begin and end on their own, some are connected to the previous or following one, by means of questions that are answered in the subsequent tale, or characters which reappear.