Podcast
Calculating the multiverse
If there's a multiverse, then how many of its component universes are like our own?
News story
Calculating the multiverse
If there's a multiverse, then how many of its component universes are like our own?
News story
What's happening and who's listening?
Why are physicists unsure about what it means to say that something has happened? Anthony Aguirre and Sean Carroll explain.
News story
Life's dirty secrets
Some uncomfortable problems in our understanding of life.
Article
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.
Article
The cosmic family tree
Mapping the ancestral history of spacetime in an effort to unite quantum mechanics and general relativity.
Article
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.
Article
The Basel problem
This problem about an infinite sum has a surprising answer.
Article
Euler's polyhedron formula
This surprising result about 3D shapes tells us something deep about the nature of space.
Article
The 36 officers problem
Euler may not have cracked this problem completely, but it led to a lot of important work, including on what we today know as sudoku.
Article
The knight's tour
Can you move a knight on a chessboard so that it visits every square exactly once? Euler was one of the first to analyse this problem systematically, but some questions about it are still open today.
Article
The bridges of Königsberg
Can you find a path through on this city map that crosses every bridge exactly once? Euler's answer to this problem started off the filed of graph theory.