Tech expert Steve Caplin discusses Tesla's non-Ford assembly line, Musk's dull investor day and a setback for his Neuralink. Breadcrumbs will be the key to exploring caves on Mars, it seems, while the iMAG could be the way to end uncomfortable endoscopies and 3D printing taking place within the human body could soon be feasible. There's a crowdfunded exoskeleton to help with hill-climbing (or even shopping or visiting museums) and on the River Lee, there's an ingenious hand-powered rolling bridge.

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