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A round-up of some of the latest news in the arts world.

John Studzinski of Blackstone LLP has donated £5 million ($9.87 million) to the Tate Modern for the museum’s expansion plans, estimated to cost £215 million ($425 million), which will include the construction of an 11-story glass building on the south side of the gallery.

Joost, a peer-to-peer online application (from the creators of Skype) that allows users to watch streaming TV on their desktops, has just signed a deal with Creative Artists Agency to increase content and distribution. As of now, Joost has 150 content channels and distribution deals with Viacom, CBS and Turner Networks.

Khaled Hosseini, author of the “The Kite Runner”, which has sold almost 5 million copies in the US alone, has released his second novel “A Thousand Splendid Sons”.  Mr Hosseini’s new book tells the story of two very different Afghan women married to the same man, who begin as rivals but soon form a bond as they struggle to live an increasingly perilous Afghanistan.

Employees at the Hilligoss Galleries in Chicago believe that a middle-aged couple is responsible for the theft on Sunday of the 370-year-old Rembrandt etching “Adam and Eve”, worth about $60,000.