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For vaccine dosing decisions, past experience and best guesses won the day in the mad rush to beat back the pandemic. Modelling tools might have made a difference.
Some people develop multiple sclerosis after an infection. Could a vaccine prevent that — and what does it reveal about the long-term effects of viruses?
Data dashboards have been an important part of pandemic response and planning. What have their developers learnt about communicating science in a crisis?
Separating urine from the rest of sewage could mitigate some difficult environmental problems, but there are big obstacles to radically re-engineering one of the most basic aspects of life.
Immunologists have raced to work out how to protect against multiple variants of SARS-CoV-2. Their research has yielded a wealth of insights and a few surprises.
People abandoned thriving cities in Mesopotamia, the Indus Valley and farther afield at about the same time as a decades-long drought gripped parts of the planet.
Countries have reported some five million COVID-19 deaths in two years, but global excess deaths are estimated at double or even quadruple that figure.