I read the saddest story that I have read in a very long time today.

Gender Gap

After I read it, I found it really stuck with me. I guess my problems are not so bad...

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Today's question:
Who is credited with "inventing" the heavy metal devil horns hand symbol? (see pic) (1 point)



Bonus question:
Who disputes that claim and says he first did it on an album cover? (1 point)