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Physics

How a century-long argument over light’s true nature came to an end

Two of the forefathers of quantum theory, Albert Einstein and Niels Bohr, had a famous argument over whether light is a wave or a particle. Columnist Karmela Padavic-Callaghan finds that the matter has been settled once and for all

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Health

Iodised salt has become uncool but many of us need to eat more iodine

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Environment

How a DIY worm farm can compost food scraps, paper or a whole kangaroo

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Mind

The best kind of olive oil for brain health

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Physics

How Anthony Leggett pushed the boundaries of quantum physics

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Health

Are humans degenerating genetically and getting dumber as a result?

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Health

A negative attitude towards ageing is making you age faster

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Technology

Social media is a defective product

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Space

What does it mean if the universe has extra dimensions?

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Mind

Why are we so suspicious of do-gooders?

A growing body of research shows that we tend to discount a person’s good deeds if they stand to benefit from them. Columnist David Robson explores where this instinct comes from – and whether we should resist it

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Space

What is a galaxy? That's a surprisingly difficult question to answer

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Humans

We’ve only just confirmed that Homo habilis really existed

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Mathematics

The secret to guessing more accurately with maths

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Space

Why Yuri Gagarin wasn’t the first in space – and who beat him to it

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