Meta had delayed releasing Muse, its A.I. agent app, for months over safety concerns. Then new competition forced Mr. Zuckerberg’s hand.

Southbank Centre, London
Wang’s avatar performs music from Ravel and Debussy to Prokofiev and Liszt while dizzying virtual worlds take shape around her in this virtual reality installation

It might be the first time that a soloist at the Last Night of the Proms is simultaneously giving another performance in another London venue. Playing With Fire is an installation that lets the pianist Yuja Wang be in two places at once – or perhaps in two universes. Nine pieces of music conjure nine luminous dreamworlds for an audience wearing VR headsets: Disney’s Fantasia on steroids.

A collaboration between the pianist, the director Pierre-Alain Giraud and artist Gabríela Friðriksdóttir, produced by Vive Arts and Atlas V, it has already been seen in Cannes, Paris and Shanghai, and now has a home in London until new year.

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© Photograph: Vive Arts and Atlas V

© Photograph: Vive Arts and Atlas V

© Photograph: Vive Arts and Atlas V

The release of Muse Glimmer, a model that can be freely downloaded and modified, is likely to intensify a debate over whether A.I. should be restricted.

The young mathematician won a prestigious Fields Medal for her work on the so-called Kakeya conjecture.

The awards are bestowed only once every four years to mathematicians under the age of 40.

China continued its accelerated launch pace with a series of missions, but long silence followed liftoff of a Kuaizhou-11 solid rocket Wednesday, suggesting potential issues.

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