I haven't done the math. 1,500 people feels like a line, 15,000 people feels like enough.
Wow, those are some hugely divergent preferences from mine. I'm pretty sure I would trade the lives of all the remaining tigers in India to keep my family alive. I'll have to update what I expect human-CEV to look like (given that are preferences are likely much closer than that of a randomly selected person [since we had to pass through many filters to end up on this web forum]).
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.