Put on your Science Bro thinking caps and solve this puzzle. It may be a title clue for "Avengers 4." It also may not. Those are the options!

Directors Avengers 4" -- but also opening a new restaurant, see below -- and shared a new mystery with fans.

We just got a should be giving us the official title for "Avengers 4." It's possible we'll also get the first trailer in the next couple of months.

The Russos just teased fans with a black-and-white set photo, suggesting we "Look hard..." for clues:

Some fans spotted four As for "Avengers 4," among other things:

That "End Game" might be a slight stretch, but we love it anyway. End Game for the win. One word or two, though?

You may have also noticed that Joe Russo is now co-owner of a restaurant in downtown Los Angeles, and he worked his Rolodex to get several MCU stars in early, before this Thursday's grand opening:

his classic Captain America "Avengers 4" photo from the other day.

All of this should put a smile on your face, which may or may not end in tears when "Avengers 4" premieres next May.

Want more stuff like this">Like us on Facebook.