David Datuna, an artist living in New York, walked up to the banana and pulled it off the wall with the duct tape attached.
Performance artist Marina Abramovic opened an exhibition in her hometown Belgrade for the first time in 44 years with her retrospective "The Cleaner."
Ai-Da, named after British mathematician and computer pioneer Ada Lovelace, will be able to track faces to recognise facial features and mimic expression, its makers say.
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