mask or lockdown effectiveness b/c you've clearly made up your mind and I have no desire to waste my time. But you are in a word, wrong, to say that scientists didn't change their recommendations based on new information.

"The CDC now recommends wearing cloth face masks in public settings where social distancing recommendations are hard to maintain, such as grocery stores and pharmacies, and especially in areas where there is a significant level of community spread.

Citing several studies, the CDC said it changed its recommendation based on evidence showing that the virus can be transmitted by people who are asymptomatic, or who are not yet showing symptoms or feeling sick.

“We now know from recent studies that a significant portion of individuals with coronavirus lack symptoms (‘asymptomatic’) and that even those who eventually develop symptoms (‘pre-symptomatic’) can transmit the virus to others before showing symptoms,” the CDC’s webpage says. “This means that the virus can spread between people interacting in close proximity — for example, speaking, coughing, or sneezing — even if those people are not exhibiting symptoms.”"

Next time maybe be sure someone is actually wrong about something before you so aggressively try to call them out.