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A worker at Entocycle, a company developing technology to farm insects on a large scale for industrial protein production as a more sustainable alternative to meat, checks flies in an experimental net chamber in London, United Kingdom, on 10 October 2019. She wears a mask as the floor is covered in rotting waste material to incite the flies to lay eggs. (Luca Locatelli, for National Geographic) NO SALES, THIS MATERIAL IS FOR SINGLE USE PUBLICATIONS IN PRINT OR FOR A TEMPORARY ONLINE PUBLICATION, AND MAY BE USED EXCLUSIVELY TO PUBLICIZE THE 2020 WORLD PRESS CONTEST AND EXHIBITION. IT MAY NOT BE PUBLISHED AS PART OF AN ARTICLE OR ANY OTHER ITEM THAT CONTAINS NO DIRECT LINK TO WORLD PRESS PHOTO AND ITS ACTIVITIES. THE PICTURE MAY NOT BE CROPPED OR MANIPULATED IN ANY WAY. KEYSTONE PROVIDES ACCESS TO THIS PUBLICLY DISTRIBUTED HANDOUT PHOTO. THE COPYRIGHT IS OWNED BY A THIRD PARTY.