The British businessman accused by the US of selling weapons to Iran has been granted bail and could be freed this week.

The noise of cars, machines and other forms of human activity could be affecting growth of wild flowers and trees, as well as animals nearby.

The skydiver Felix Baumgartner is more than halfway to his goal of setting a world record for the highest jump.

The son of a retired British businessman extradited to the United States over arms dealing charges has urged David Cameron to intervene to secure his father bail.

This year the women's game will change again when the sport debuts at the Olympics

Starring: Gina Carano, Ewan McGregor

Whitney Museum of American Art, New York

"Living is such a tangle – I've only started on this – but – I'll stop." So wrote farm-born artist Georgia O'Keeffe in 1916, a few months after she had begun a correspondence with well-heeled, married photographer Alfred Stieglitz. It would continue across thousands of pages during a tumultuous and stimulating relationship which only ended with his death, 30 years later.

The late David Askevold is the kind of artist whose great influence on contemporary art is perhaps best tracked via his influence on other artists. As a teacher at California's CalArts in the 1970s he taught a generation of artists that included Mike Kelley and Tony Oursler, who were intrigued by his experiments in video, installation and photography, opening up, for them, a distinct form of eerie, edgy conceptualism. Indeed, it was Kelley who called him the "Disorientation Scientist", in an obituary in Artforum following Askevold's death in 2008. It's a useful moniker, used as the title of this small retrospective at Camden Arts Centre, in terms of understanding the artist's work, looking at hallucinogenic, psychedelic or dramatic experience with an analytical eye.

Is it comedy, improv, mime? This double act from America is hard to define, but so easy to laugh at, and it has Brian Logan in stitches

A South London teenager thought to have links to cyber activism groups Anonymous and LulzSec was arrested today as part of a global sting, police have confirmed.

On 16 July 1945, the first atomic bomb tests were held in top secrecy in the New Mexico desert.

What is believed to be the only surviving, authenticated portrait of Billy the Kid fetched more than 2.3 million dollars (£1.4m) at auction in Denver, Colorado.

Smoke from a massive wildfire in eastern Arizona that has claimed more than 30 homes and forced nearly 10,000 people to flee has officials worried about serious health impacts to residents and firefighters as tiny particles of soot in the air reached "astronomical" levels.