There’s a danger in the UK that the NHS could be overwhelmed by spiralling COVID cases. Vaccines will help get things back under control, but in the short term will probably have a limited effect.

This is because the UK’s priority is to vaccinate people over 70 first. This should reduce the number of COVID patients in hospital overall, as admissions increase steeply with age, but it won’t help free up space in intensive care, as the majority of COVID patients admitted are under 70. For pressure on intensive care to lessen, lockdown will need to drive down cases too.

But given that the new, probably more infectious strain of the coronavirus has spread all across the country, it will be a while before things are back under control – probably beyond the end of February, when the prime minister has said restrictions might begin to ease.

Fish need protecting from roads. Where highways cross small rivers, structures called culverts allow water to flow underneath but can stop migrating fish from crossing. Toxic chemicals from vehicles can also run off the tarmac and poison fish in surrounding waters.

And new research into ancient megasharks known as megalodons has found that mothers gave birth to pups that were bigger than humans. Gruesomely, these not-so-baby sharks likely got so big by eating their siblings in the womb.

Rob Reddick

Commissioning Editor, COVID-19

EPA-EFE

How will vaccines affect the length of England’s lockdown?

Peter Sivey, University of York; James Gaughan, University of York

COVID-19 vaccines could substantially reduce hospital admissions, but will be slower at freeing up space in intensive care.

Salmon crowd a river in Washington State in the US as they swim upstream to spawn. Danita Delimont/Shutterstock

How city roads trap migrating fish

Stephanie Januchowski-Hartley, Swansea University

A recent US study found tyre chemicals were polluting rivers and poisoning migratory salmon.

Megalodons are the biggest predatory sharks ever discovered. from www.shutterstock.com

Giant ancient sharks had enormous babies that ate their siblings in the womb

Tom Fletcher, University of Leicester

New fossil detective work sheds light on the life of megalodon, the biggest predatory shark ever discovered.

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