Brain drain and spent voices!

So, this is going to be more difficult than I first thought. I've just spent all day finishing off West: "Respiratory Physiology" (7th ed), filled with flow-pressure curves and airway resistances. I'm not sure I'll ever get the hang of deriving the equation for Alveolar Dead Space.


Anyway, I might have spent all today's quota of little grey cells on effort independent flow, but I shall spend the rest of the daylight hours reading to my wife and the bump. We're a few chapters into Harry Potter and the Philosopher's stone - Sorcerer's stone for you 'across the ponders'. She enjoys it because I do all the voices, it's great fun and helps me to relax.