Here's a new mentalfloss.com Brain Game Think Thursday challenge. Good luck!

Which of these presidential first names don't belong with the other three, and why? HINT: The answer specifically involves the first names, not the lives or policies of the men behind them. And no, the answer is not "only one doesn't end in the letter Y."

BILL (Clinton)
HARRY (Truman)
JIMMY (Carter)
TEDDY (Roosevelt)

Here is the ANSWER.

THE ANSWER:

HARRY TRUMAN.

While the other names are nicknames (Bill = William; Jimmy = James; Teddy = Theodore) Truman's first name was really Harry.

Thanks for playing! Tomorrow - Free-for-all Friday, PLUS we announce the winners of last week's contest.