As COVID-19 can linger on certain surfaces for days, scientists have been scrambling to create potent antiviral coatings. A spray developed by the Hong Kong University of Science and Technology (HKUST) last April uses heat-sensitive polymers that release disinfectants on human contact and can offer protection for up to 90 days. Meanwhile, researchers at Israel's Ben-Gurion University of the Negev revealed that they were working on a similar nano-metal and polymer-based

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