Intellectual Challenges

I originally envisioned this as a major IQ/Cultural Literacy test...but it looks like I won't have time to fully bring my vision to life. Therefore, you'll get a small sample today, and with luck, a few additional questions parceled out over the next few weeks. In addition to possibly providing some minor stimulation of your brain cells, my hope is to scatter some cultural literacy about as a side effect.

And yes, I DO define cultural literacy as knowledge of Star Trek and 80s comedy movies. Why do you ask?

Anyway, here's today's quiz question: What do the subject of these four photos have in common. (Answer tomorrow.) Enjoy!