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Should we protect historic neighbourhoods from redevelopment when new homes are desperately needed?Manuela Saragosa looks at two cities at opposite ends of the spectrum. Historian Qin Shao tells of the destruction of her home city of Shanghai over the last 30 years, as entire districts have been demolished to make way for sparkling new high rise buildings. Meanwhile Laura Foote of the campaigning group Yimby Action explains why young residents of San Francisco like her are demanding the construction of many more affordable homes.So is it possible to strike a balance between the need to conserve and the need to build? Manuela visits one London building recently saved from the developers - the Smithfield market in London's financial district - and asks Chris Costelloe of the Victorian Society where he would draw the line.Producer: Laurence Knight(Photo: An old residential building being demolished to make room for skyscrapers in Shanghai; Credit: Johannes Eisele/AFP/Getty Images)

Facial recognition tech is spreading everywhere, but it can still be fooled with a bit of face paint. So should we be worried?Ed Butler speaks to Professor Alan Woodward, professor of computer science at the University of Surrey, and James Stickland, chief executive of facial recognition tech developer Veridium.Meanwhile the BBC's China media analyst Kerry Allen tells the grim story of a man who tried to use a dead girl's face to get a bank loan. Plus Ed's face is transformed into a Mondrian painting by anti-surveillance activists The Dazzle Club.(Picture: Ed Butler's face covered in anti-surveillance paint; Credit: Ed Butler)

How online shopping is fuelling insecure work for delivery drivers. British film director Ken Loach talks about his new film Sorry We Missed You, looking at the impact of insecure work on family life. The BBC's Edwin Lane rides along with a gig economy worker delivering Amazon parcels. And analyst Andrew Lipsman from eMarketer explains how Amazon Prime is driving demand for faster delivery times.(Photo: Amazon-branded delivery vans seen in May 2019, Credit: Getty Images)