Quantum Field Theory, it's come a long way,
Since Oscar & Walter started out one day,
Rewriting Schrödinger's equation in a relativistic way,
But their effort was partly in vain,
For the electron did not see fit to deign,
Being a spinor with spin h-cross by two,
Physicists they were left without a clue.
Then along came Paul, stared into the fire,
Pulled out an equation with anticommuting stuff,
Alack! Alas! The equation seemed wrong,
Negative energy eigenvalues it did acquire,
There was a solution, though it was rough,
Fill the vacuum with an electron sea,
Now if there is a hole where an electron should be,
Why! That is a positron can't you see?
Those were the days of old QFT
Skip forward in time, two dozen more years,
And Richard and Julian, and Shinichiro San,
They smoothened the wrikles and layed rest to fears,
And things it seem'd were falling in place,
Till other new problems blew up in our face,
Are neutrinos massless? Are quarks confined?
Is Gravity quantised? Howe'er shall we find?
M-theory, and unification, why it's all still a puzzle,
And science marches on from hurdle to hurdle!
From this eternal story we can surely surmise,
That theories are made, and problems are solved,
These theories then fade, as new problems arise.