This shirt is great.  Science is friend to most nerds.  When I was a kid I had three different chemistry sets and I loved playing mad scientist.  Any experiment that involved things bubbling over or potentially exploding I was all over.  My sets included all kinds of acids, dangerous chemical gasses, and instructions on how to make gun powder.  Chemistry sets today are about as neutered as you can get.  They are effectively the same as mixing different shades of food coloring.  Check these lame kits.  They all seem to emphasize the word "safe".  I wouldn't consider myself a "tough guy", but kids today are being raised to be the biggest wimps possible.  A little dirt and risk is OK in my book.