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Technology companies are rushing to connect everyday objects to the net and to each other - is this something to be welcomed, or a cause for concern?

Also how retailers are updating the bricks-and-mortar shopping experience with easier ways to try on clothing and pay for merchandise. And what Chinese authorities have done to try to stifle online discussion of the 25th anniversary of the Tiananmen Square massacre.

Presented by Rory Cellan-Jones live from the UK's Cheltenham Science Festival, with special guests Sophie Wilson, designer of the ARM processor, and IBM Master Inventor Andy Stanford-Clark.