Could health apps and chatbots eventually replace your traditional doctor? "Let's talk about how you've been feeling over the past 30 days," says Joy. "This will help me get a sense for your current state." Joy probes a bit deeper, asking a series of questions: Do I feel hopeless? Do I feel restless? When I respond that I'm a bit stressed, Joy offers me several de-stressing techniques. Joy might appear to be my counsellor or my life coach, but the conversation I'm having is actually with a chatbot that uses artificial intelligence and machine learning to track emotions and provide mental health support - all through Facebook Messenger. Welcome to healthcare in the digital age, where smartphone owners have access to their very own doctors and therapists at the touch of a button. Joy was founded by Danny Freed after one of his best friends committed suicide. "This planted the seed for me that there must be a way technology can help anyone who is struggling with their mental health," he says.

Why is the art world getting excited about digital currency Bitcoin and its underlying technology blockchain? Eleesa Dadiani owns and runs an art gallery in London's famous Cork Street. She was born in Georgia in the Caucasus and was "breastfed by gypsies". But she is also a passionate believer in the power of Bitcoin and other digital currencies. When we meet she is busy preparing for an exhibition of sculptures made from the exhausts of former Formula 1 racing cars. One of these strange rib-cage-like creations made from the super-strong alloy inconel has been gold-plated and will sell for about £35,000. "These are pieces of history," she tells me. In a first for the tradition-bound art world of Cork Street, her international clientele will have the opportunity to pay using Bitcoin, the digital cryptocurrency underpinned by blockchain technology. The gallery will also accept other cryptocurrencies such as Ethereum, Ethereum Classic, Dash, Litecoin, and soon, Monero, she says.