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How hard is a hard problem?

How can we distinguish between 'easy problems' and 'hard problems'...

On Valentine's Day it is appropriate to consider whether humans...

Prime numbers form the building blocks of arithmetic. But if...

Aggression lies at the heart of biological competition but its...

The concept of zero developed in many cultures over thousands...

Obesity has shifted from being a rare symbol of decadence...

It is often argued that mathematics as we know it...

These are powerful forces for promoting positive adaptive behavioural changes...

Many thousands of surviving mathematical clay tablets provide much information...

This series of Geometry Lectures looks at all aspects of...