Masked Hero

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Growing up in Malaysia, Wu Lien-teh had always loved science and wanted to be a doctor. His studies took him around the world and in 1910 he brought his expertise to China to fight the plague. There he overcame discrimination to promote trailblazing measures that will be familiar to readers today, including encouraging people to wear a face covering he designed from layers of cloth and gauze: the first version of the N95 mask.