Why is the Hulk green?

You can thank Biochemistry for this lovely tidbit. Why is the Hulk green? How does he double in size in just a few seconds? How does he get stronger as he gets bigger?

My hypothesis is that, besides, you know, having extremely sped up cell replication from all the gamma rays (it'd have to be sped up at least 20,000x!) the Hulk must have evolved photosynthetic capabilities de novo from all the mutations he accumulated. Otherwise, there's no way the Hulk could ever increase so dramatically in mass! Absorbing carbon from the air would solve that problem. Plus, this would explain why the Hulk turns green when he gets angry. Chloroplasts are transcribed and assembled extremely speedily (first second), cells double (2nd second) then double in size (3rd second), the cells (just skin cells? acquire a super hard cell wall (again, like in plants - 4th second) and maybe the cells increase in size a little more (5th second?). Voila, a terrifying half-man half-plant hybrid arises. I knew this would happen when we started working on GMOs.

Worse, it seems Dr. Banner has lost all control of his cell replication mechanisms, at least when he gets angry - this is essentially a cancer (definition: loss of control of cell replication) of the worst sort, triggered by all sorts of different environmental factors.

The real problem is, of course, how the Hulk sheds all of this excess mass and these extra cells when he goes back to his alter ego. No wonder it takes so long to subdue the Hulk - how else can the Hulk have time to lose all the extra size he's gained?

And yes, I was asked a similar question on my Biochem exam today, so I do have an alibi for thinking about all this. Although perhaps not in such fine detail or for as long as I have done.

Don't even get me started on the physics of Iron Man and his suit. It won't be pretty. Although the Iron Man movie was absolutely fantastic.