Stock Photo - Researcher Mehdi Keshavarz Hedayati (R) and project manager Mady Elbahri stand in a laboratory of the Technical Faculty of Kiel University (CAU) in Kiel, Germany, 21 February 2014. They have developed a protective coat based on nanotechnology which protects against ultraviolet (UV) light. This technology could prolong the lifespan of organic solar cells or it could be used for outdoor clothes. Photo: Carsten Rehder/dpa | usage worldwide. - Kiel/Schleswig-Holstein/Germany

Stock Photo: Researcher Mehdi Keshavarz Hedayati (R) and project manager Mady Elbahri stand in a laboratory of the Technical Faculty of Kiel University (CAU) in Kiel.

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