Oh, almost everything! I’m a nerdy person. My wife is a research scientist, and she studies brain-manipulating parasites (she would say she studies “parasites that manipulate host behavior), which we don’t get into in the book - very tangentially, some of her knowledge was useful in our biology chapter, and by being who we are we have a great connection network to help us find out about obscure things.
But none of this stuff is stuff we have expertise in. So part of why this was so much work was so we could become as expert as possible, or talk to someone who is, so we don’t say anything too wrong.
For me, the most mind-blowing thing as far as creep factor was the brain-interface stuff. We cannot do this yet, but there’s no reason to suppose you couldn’t make a machine that enhances memory, possibly intelligence (that’s a tougher question I think), but the stuff like detecting lapse in focus is entirely possible. If you’re at your job, and you’re supposed to be focusing on work but you’re on Facebook or you’re thinking about your mother in law coming by - you’re lapsing - your boss could detect that using this technology and say “You’re not utterly focused.”
Which sounds like a pure unbridled nightmare. There’s a not-entirely-negative version of that, which would be for a jet pilot or a surgeon, where you might recognize the the person buying your services has a right to insist you’re focused. BUT - here’s the mind-blowing creepy part - in a world where this is a thing, there’s an incentive to be that employee who’s totally cool with their boss monitoring their brain. So imagine you’re a boss, you don’t even have to imagine this is an evil boss, but someone who’s just trying to do their best job or make money, and that boss is presented with 2 employees - employee A who refuses to have their focus monitored by an external apparatus, and employee B accepts. And now you have an arms race, especially as the technology develops. You could argue that this is already happening. Something like 20% of elite academic researches are already admitting to using brain-enhancing drugs so they could work 16 hours a day or more. It’s already an arms race - who gets tenure, the person who works 16 hours a day or not? So you’re talking about a world where you can’t opt out without serious consequences. And that, to me, is creepy.