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Different masks protect against Covid-19, and its delta and lambda variants

• hardmaru 5y ago
  The title should be "How different masks protect against Covid-19, and its delta and lambda variants" but for some reason the "How" got auto-cutoff by the HN submission system for some reason...
• gaeaasd 5y ago
  Fake news. Gay news. Liberal propaganda.
• charbonneau 5y ago
  No sources, that's how I like my medical information.