Einstein's Brain

I heard that they've got Einstein's brain
just sitting in a jar.
I don't know where they keep it,
but I hope it isn't far.
I need to go and borrow it
to help me with this test.
I've answered twenty questions
but on every one I guessed.
If someone asks you where I've gone,
then kindly1 please explain
I'll be right back; I've just gone out
to look for Einstein's brain.