Masks are effective only if you wear them properly. Here’s the right (and wrong) way

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• Refusing to wear face masks should be as taboo as drunk driving, science chief says
• Can the AC filter in your home, office or local mall protect you from Covid-19?

• Refusing to wear face masks should be as taboo as drunk driving, science chief says
• Can the AC filter in your home, office or local mall protect you from Covid-19?