Ah now that I've snooped out some of Lisa's papers, it looks like she's spent time working on all items (3) to (7) !:
From Steven's list of difficulty:
Quote:
In terms of difficulty here is my ladder (by all means not absolute).
(1) GR simple.
(2) QM simple.
(3) Quantum Electrodynamics harder.
(4) Quantum Chromodynamics harder still.
(5) Electroweak theory harder still.
(6) GUTs All very difficult.
(7) String Theory, Superstring Theory etc hardest of all.
What makes (7) so difficult it incorporates a lot of pure mathematics which is outside the scope for many physicists and applied mathematicians.
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Hmm … no slouch all right !!
Cheers