World's Hardest Riddle
In re: "I turn polar bears white" Riddle:
The answer is "no."
The key is the last line of the riddle, that is, the QUESTION, "Can you guess the riddle?"
And, as it unsurprisingly turns out -- "97% of Harvard graduates can not figure this riddle out, but 84% of kindergarten students were able to figure this out in 6 minutes or less."
So the answer is "no."