Kevin McCloud looks at properties that push the boundaries of design, including a concealed house built from glass and concrete, a gadget-filled house squeezed onto a disused plot in Edinburgh and a modern home in Cumbria.
Dutch are experts in controlling surging seas and rivers, and are developing cuttingedge technologies to deal with climate change.
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Harrison explains how spiders make webs and why they are so strong.
How the lazer cuts the steel for the harvesters
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