How much money would it take to engineer biological immortality for at least half of the world's population, within 20 years, with 99% confidence?
Yup, agreed, it's vague and that's bad. This seems to me an entirely different objection from "there's no point saying 'suppose such-and-such is dealt with by elven magic' because elven magic could solve all the other problems too".
How much money would it take to engineer biological immortality for at least half of the world's population, within 20 years, with 99% confidence?