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Easy as ABC?
Mathematicians are working hard to understand an impenetrable proof of the famous ABC conjecture.
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What is a block universe?
Has the future already already been written? Is time just an illusion? Take a step outside of spacetime with cosmologist Marina Cortês to discover the block universe.
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Time in a block universe
Fundamental physics says time is symmetric - so why does time move forwards for us in a block universe?
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Why not block time?
Is time real? Are we just puppets living out a future already written? Marina Cortês explains why she thinks time is fundamental and that we don't live in a block universe.
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The future is time
Marina Cortês is one of a growing number of physicists who believe time is fundamental. We ask her about the alternatives theories to the block universe, where time comes first.
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There may be more than one of you
The possibility that there might be many parallel worlds has just become a little more likely.
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Have you heard? The maths of rumour spreading
Mathematical models predict how fast a rumour will spread and how many people it's likely to reach.
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Hunting and being hunted
A model of the interaction between predators and prey explains why sometimes frogs appear to eat snakes.
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Maths in a minute: Einstein's general theory of relativity
What would happen if the Sun suddenly exploded? Einstein wondered the same thing, and completely changed our understanding of the Universe.
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Time to go retro
A model of backward causation in which the future affects the past could help unite quantum mechanics and general relativity – and satisfy a challenge thrown down almost a century ago by Arthur Eddington.
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The cosmic family tree
Mapping the ancestral history of spacetime in an effort to unite quantum mechanics and general relativity.
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Is gravity time's archer?
A new model argues the forces between particles in the early universe loosed time’s arrow, creating temporal order from chaos.