Admittedly, today's Brain Game may prove difficult. If you don't know the answer offhand (I wouldn't have), a bit of research may make it clear. And this is just the type of trivia that seems destined to crop up on a game show someday. Good luck!

What do the names of these five presidents
- but no others - have in common?

William McKinley, Theodore Roosevelt, Calvin Coolidge, Gerald Ford, Jimmy Carter.

Here is the SOLUTION.

THE SOLUTION:

They are all "juniors" - William McKinley, Jr. - Theodore Roosevelt, Jr. - Calvin Coolidge, Jr. - Gerald Ford, Jr. - Jimmy Carter, Jr.