Yes, and how many times must a man look up 

Before he can see the sky? 

Yes, and how many ears must one man have 

Before he can hear people cry?

Yes, and how many deaths will it take 'til he knows 

That too many people have died? 

The answer, my friend, is blowin' in the wind 

The answer is blowin' in the wind 

--Blowin' in the Wind by Bob Dylan


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