Now that I've had a little wine, I'm thinking that what about spelling stuff out with traditional math symbols? The integral symbol (for non-math folks looks like an "f") then mu (which looks like a "u") comes to mind as a start.
Drawing the structure of amino acids to spell something out also comes to mind, though that would be very biology-geeky indeed, and not make for great message copy in a photo.
I also like the quote from Indiana Jones III, in which the father says to the Nazi something about why they went back to Berlin for the diary, "try reading books instead of burning them".
It is tough to come up with a pithy slogan for science, that doesn't just sound like a pitch for a Big Bang Theory episode.