When I first met my good friend Captain Pun, he invited me to dinner to meet his wife, a physics professor at the university. Over a glass of wine I inquired into her research interests.
"Let me show you!" she said, quickly scrawling the following onto a napkin:
"Solve the nonogram and you'll soon know what I spend all of my time studying! I'll give you a clue: you're looking for a two-word answer..."
Can you solve the nonogram to help me work out Professor Pun's area of expertise?
NB The nonogram can be solved without guessing.