photo of sign outside shop that reads: You must wear a maskWriting for Nature, Lynne Peeples (@LynnePeeps) asks whether it’s too soon to lift mask mandates. She reviews scientific studies on mask effectiveness conducted around the world during the COVID-19 pandemic and examines the roles that community norms, enforcement and messaging play in the public’s adoption of mask-wearing. Image by Jèrriais janne via Wikimedia Commons.