Sure, experts do know a lot more about the virus than an average person. But, AFAIK, experts don't really have answers to these questions: - How long does the

Sure, experts do know a lot more about the virus than an average person. But, AFAIK, experts don't really have answers to these questions: - How long does the immunity last? - How much do asymptomatic people transmit? - How much do pre-symptomatic people transmit? - Related to the previous two questions, what percent of cases got infected from symptomatic people? - What percent of cases got infected from contaminated surfaces, what percent -- from aerosols, what percent -- from droplets? To a non-expert like me the questions above sound super essential. It's been more than half a year since the virus spread began. How come we still don't know? And so, while calling experts clueless is not polite, does it sound like such a stretch? Maybe it's OK, if experts actually admit they have no clue at the moment? "... revise their answers as more data comes in?" This should be a totally normal thing to do, I agree.