Researchers from the Universities of Bristol and Essex have solved the mystery of the blue sheen on the leaves of some begonias. The research team, led by Dr Heather Whitney at the University of Bristol, in collaboration with the University of Essex, have discovered that plants, including species commonly grown as houseplants or in gardens, have long been using a very special form of nanotechnology - called photonics - to create structures in their leaves that help them to harvest light for photosynthesis.

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