Short answer: Yes, masks are effective if worn properly and hands are kept properly sanitized. Widespread masking also prevents asymptomatic people from spreading the virus. Masks have the ancillary benefit of showing solidarity, reducing stigma, and showing a willingness to follow health guidelines.
Are humans the driving force behind climate change?
Does Creatine Really Make You Stronger?
Consumer Guide to Research
Advertisers too often make extraordinary claims about their product without providing any proof. They may point to “research” from a questionable group. Or, they may have testimonials (anecdotes) from celebrities or sports figures claiming how the product helped them become stronger/more beautiful/smarter. Don’t believe any if. If an advertiser can’t provide evidence of their claims is because their product most likely does not work.