A rapid isothermal method for detecting severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus responsible for COVID-19, is reported. The procedure uses an unprecedented reverse ...
The article on exponential growth (12 December 2015, p 34) reminded me of a 1940s Lloyd's Log Problem Book puzzle. It described a lily that doubles in size every day, taking 36 days to completely ...
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