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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.
Time in a block universe 
Fundamental physics says time is symmetric - so why does time move forwards for us in a block universe?
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.
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.
There may be more than one of you 
The possibility that there might be many parallel worlds has just become a little more likely.
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.
Hunting and being hunted 
A model of the interaction between predators and prey explains why sometimes frogs appear to eat snakes.
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.
Calculating the multiverse 
If there's a multiverse, then how many of its component universes are like our own?
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.