We have an outstanding graphic design intern who just started so we're going to have T-shirts made for each category rather than just the generic one with the logo.   If you have ideas for cool science-related and/or funny t-shirts that just need a capable hand to bring them to life, make a comment and we can see about making some magic happen.   

Then we can send writers here any kind they want.   We are all about customization.

Edit:

Here are a few:

Math ...

Biology ...

Space ...

Physics ...

and ...

... and chemistry and lots more obviously.   Check them all out.