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The real-world impact of the cryptocurrency business. Edwin Lane reports from Iceland, which has attracted power-hungry Bitcoin mines looking for a cheap source of electricity. Arni Jensen from the Borealis Data Centre shows him around a cryptocurrency mine near Reykjavik, and Johann Sigurbergsson from the geothermal energy company HK Orka describes the massive growth in the demand for electricity the miners have created. And the mayor of Plattsburgh, New York, Colin Read explains why his city is the first in the world to announce a temporary ban on cryptocurrency mining, amid concerns over its electricity supply.(Photo: An illustration of Bitcoin mining, Credit: Getty Images)

He’s had a few outbursts in recent weeks. Calling stock analysts boring. Criticising his critics over the performance of his cars. Is he a genius, behaving like a playground bully, or both? Tim Urban, a US blogger who has interviewed Mr Musk, says his lack of a PR team means his opinions come unfiltered, but his innovations make him a genius. We also hear from Melissa Schilling, a professor at the Stern school of management and the author of Quirky: The Remarkable Story of the Traits, Foibles, and Genius of Breakthrough Innovators Who Changed the World. She says he shares a number of traits with Nikola Tesla, the namesake of his cars. Not everyone though is so enamoured. James Moore, chief business commentator for the UK's Independent newspaper, reckons he needs to engage with his critics rather than calling them names, or else run the risk of having them think they are right. Thomas Asterbro, professor of entrepreneurship at the HEC Paris business school, says his pioneership may not be such an advantage business-wise. Companies like Amazon and Facebook were not the first in their field, but they are now dominant.(Picture: Elon Musk and Grimes attend the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at The Metropolitan Museum of Art on May 7, 2018 in New York City. Credit: Getty.)

Why are we being watched more and more by technology, including in the workplace? Is it an aid to hard work, or prelude to oppression? Wiretap co-founder Jeff Schumann creates software that monitors employee activity on workplace messaging apps. He says his technology is good, and can protect employees from backstabbing co-workers.But to many, this technology has sinister potential. Professor Andre Spicer at Cass Business School in London says it is a reminder for employees of who is boss.Ben Waber, president of a firm called Humanyze, tells presenter Ed Butler it has huge potential when it comes to spotting the previously unknown patterns of good productivity. Even having bigger lunch tables in the office canteen can increase output, as workers have more opportunity to chat and share ideas, he says.(Photo: Giant surveillance desk with monitors. Credit: Getty Images)