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Invisible Numbers

According to Dunbar’s theory, people can ‘handle’ up to about 150 relationships – whether in early hunter-gatherer societies or the modern workplace (Credit: Emmanuel Lafont)
Invisible Numbers

Why 150 is a ‘magic number’

World Cup players Simone Boye Sørensen, Luna Gevitz, Sandra Sepúlveda and Diana Ospina Garcia all share the same birthday - 3 March
Invisible Numbers

The 'birthday paradox' maths problem

By Kit Yates
A basic mathematical calculation error has fuelled the spread of coronavirus (Credit: Reuters)
Invisible Numbers

The deadliest numerical error of 2020

By David Robson
Conceptual pollution image (Credit: Emmanuel Lafont)
Invisible Numbers

The toxic killers too small to see

By Tim Smedley
Protestors in Sudan (Credit: Getty Images)
Invisible Numbers

What is the '3.5% rule' of revolutions?

By David Robson