How many times?

And how many times must a cannon ball fly,
before they're forever banned?

And how many times can a man turn his head,
and pretend that he just doesn't see?

And how many ears must one man have,
before he can hear people cry ?

And how many deaths will it take till we know,
that too many people have died?

The answer my friend is blowing in the wind,
the answer is blowing in the wind.

- Extract from Bob Dylan's Blowin in the Wind