3D-printed concrete cycle bridge opens and other news

BBC Click's Nick Kwek looks at some of the best of the week's technology news stories, including:

  • A 3D-printed concrete cycle bridge is unveiled in the Netherlands

  • A major security flaw, dubbed Krack, puts wi-fi connections of business and homes around the world at risk

  • Giant robots from the USA and Japan battle each other

See more at Click's website and @BBCClick.