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Why are US Covid cases falling?
From herd immunity to the weather, Tim Harford explores the theories

Covid 19 death count: Which countries are faring worst?
Tim Harford finds out if we can trust international comparisons with the available data.

How much Covid in the world?
Counting all the virus particles in every human on the planet.

Glasgow vs Rwanda
Could life expectancy in some parts of Glasgow be worse than in Rwanda?

The rapid test row
The huge row among scientists about rapid coronavirus tests.

Counting Covid’s impact on GDP
Which countries have done worse, and what can GDP tell us?

How effective is one Covid vaccine dose?
Calculating the protection given by the Pfizer/BioNtech vaccine

Ants and Algorithms
David Sumpter describes the algorithms ruling the world

Numbers of the year: Part two
Tim Harford showcases statistics from 2020

Numbers of the year: Part one
Tim Harford showcases statistics from 2020