## News from the world of Maths

Scientists have calculated the decimal digits of the number pi to a record 62.8 trillion places.

As the Delta variant is worrying the UK, researchers from the JUNIPER consortium have published all they know about it.

Could COVID-19 change our expectations for clear air indoors?

Imagine a world without computer errors. Tony Hoare, inventor of the famous Quicksort algorithm, is working on making it possible.

What has mathematics made possible? Tell the world and win prizes!

Where have the COVID-19 vaccines got us so far and where we are likely to be when the rollout is complete?

It's with great sadness that we learnt about the death of John Haigh last week. As a small tribute to Haigh here is a collection of articles he wrote or co-wrote for *Plus*.

You are faced with a difficult problem, it is not easily solved. How do you feel? Well, if you are Avi Wigderson, one of the winners of the 2021 Abel Prize, you are very happy!