A Janus evaporator with a low-tortuosity pore structure is reported for water generation from highly salty water. The unique pore structure together with the asymmetric wettability enables the evaporator to float on water with excellent salt excretion properties and heat localization, resulting in stable steam generation.

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IgG–IgM immunochromatographic strip for rapid screening of SARS-CoV-2 infection including confirmed patients, suspect and asymptomatic carriers in 15 min.