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Illumination of a book (‘Paradise Lost,’ by John Milton) with the nanobionic light-emitting plants (two 3.5-week-old watercress plants). The book and the light-emitting watercress plants were placed in front of a reflective paper to increase the influence from the light emitting plants to the book pages. Credit: Seon-Yeong Kwak

Illumination from nanobionic plants might one day replace some electrical lighting. By embedding nanoparticles into the leaves of watercress, engineers have induced the plant to give off dim light for nearly 4 hours. They believe engineered plants will one day be bright enough to act as desk lamps or street lights. “The vision is to make a plant that will function as a desk lamp – a lamp that you don’t have to plug in...