Citizen science: how you can contribute to coronavirus research without leaving the house

As scientists frantically try to find drugs to slow COVID-19’s spread, citizen science offers an opportunity for all of us to get involved.
Olympic authorities were quick to deny that the green pool posed a risk to divers’ health, but that actually depends on why the water changed colour. Reuters/Antonio Bronic

Going for … green? Why Rio’s swimming pools are changing colour

The possible culprits are: a sudden algae bloom; a change in pool alkalinity; or a chemical reaction in the water. How do these cause a change in the colour of the water?

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