Steve Caplin discusses the latest tech news with Simon Rose. As well as some bizarre Twitter blue ticks, there are Japanese robotic spiders to check sewers, cameras strapped to sharks to map seagrass meadows off the Bahamas, rats dancing to Mozart, the Ministry of Defence firing the first-ever real laser weapon, a Swedish wooden choir, a desk to facilitate using a laptop outdoors, a Japanese mission to collect moon dust and crowdfunding the monitoring of the modal frequencies of bridges to warn of possible collapse.

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