Explanation:
Surgical robots are not operating independently. Yet, what they are doing is increasingly helping surgeons to operate more effectively. Although the current generation of robots are highly specialized machines, they are still controlled by a highly skilled doctor.
A supporter or a helping jand
It has no mass! Matter is something that CANNOT! have two things at the same spot at the same time. Say you are sitting in a desk at school, no matter where someone else sits, (by you, on top of you, on the desk) they are still not taking up the same space as you are. Sound though, can travel everywhere making it difficult for it to take up only one spot at a time. :)
