Colour-changing ink allows objects to swap designs

Nick Kwek of BBC Click explores this week's best tech stories, including:

  • Alibaba co-founder and chairman Jack Ma stepped down from an e-commerce giant
  • The longest electric car trip in the world was completed with a trip from China to Germany.
  • Color-changing inks that respond to light at different wavelengths were developed by the Massachusetts Institute of Technology.

View more Click website and BB

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