Biden toughens Covid vaccine rules

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Millions of workers will be required to be vaccinated as the president faces pressure to combat a surge in cases. How some animal species are evolving far more rapidly than expected - and why climate change is the likely reason. And we hear about the Ig Nobel awards for unusual scientific research that makes us laugh, then think. This year's winners include a team investigating whether having a beard decreases your chance of being punched in the face, and another which asked if countries with overweight politicians are more corrupt.