Present Perfect - practical example

So here is a perfectly formed question in the 'present perfect':

Has the Large Hadron Collider Destroyed the World Yet?

What is that? Well, it is the biggest physics experiment in the world. Look up 'CERN' in Wikipedia (link to 'Simple English') or your favourite search machine (mine is 'Clusty') and you will find lots of information about the centre in Switzerland.

There are a lot of people who are worried about this new experiment - they believe that it will create little 'black holes'. These black holes could then grow and ... swallow the world!

Here's the link to the question (and the answer).

http://www.hasthelargehadroncolliderdestroyedtheworldyet.com/

Your homework :-)
Q) How many possible answers are there to the question above? Please write them in full using the 'present perfect'!!