Who should be vaccinated first?

Modelling shows that old and vulnerable people should be prioritised.

How were the vaccines tested?

Like any medical drug, vaccines are tested in large-scale randomised controlled trials.

How effective are the vaccines — and how do we know this?

The efficacy of vaccines is estimated from trials, using statistical techniques.

Since herd immunity will protect us all, why do I need to get vaccinated?

Because the vaccine may not stop transmission of the virus.

Are the vaccines safe?

Yes the approved vaccines are safe. If you balance the risks, then taking the vaccine is much safer than taking your chances with COVID-19.

What's the price for relaxing the rules?

We are all longing to go into a lower tier, but this can come at a high price later on.

Some lovely proofs by picture

Don't like trigonometry? Don't worry, here are three beautiful proofs of a well-known result that make do without it.

Maths in a minute: Triangular numbers

Triangular numbers: find out what they are and why they are beautiful!

Physics in a minute: The double slit experiment

One of the most famous experiments in physics demonstrates the strange nature of the quantum world.

The fingernail problem and metallic numbers

A beautiful geometric problem opens the door to the world of metallic numbers.

Clearing the air: Making indoor spaces COVID safe

New research shows that ventilation is crucial and that masks are effective.

Dynamic numbers

Holly Krieger has won a Whitehead Prize for work that combines number theory and dynamical systems.

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