I've heard that they're coming up with electronics that are supposed to be able to delay the onset of Alzheimer's, but it's probably more preventive than curative, and I'm not sure of just how much it or other chemical treatments can do right now. Terry Pratchett is a writer I've read much too few books of considering how much I liked the ones I did, and I find the irony of someone whose calling it is to set things down on paper so they'll be remembered losing their own memory cruelly humorless. You always fantasize about being able to ask a writer what they meant when they wrote this or that, and you're picturing a writer who can remember what he wrote.

And yeah, Stephen Hawking did his own voice on that episode of the Simpsons and played poker with Newton and Einstein on a holodeck, so...