Not yet unless they have been invented by millionaires and not spread out to the rest of the world
it hasn't been invented yet.
What hasn't been invented is a flying car!
Yes, the egg cracker has been invented.
YES it has been invented
Bionic eyes have not been invented yet.
Umm it really as not been invented yet so... I can not really say yet
There are so many things that people of the past have dreamed of but never invented any failed invention is a thought of the past that hasn't been invented yet.
something that hasn't been invented yet is a teleportation device Manned Interstellar Travel
The aeroplane has not been invented yet.
No, it had not been invented yet.
Cell pphones have not been invented yet but cell phones have.