A hosts holds a graphene chip used for Internet of Things (IoT) of the German RWTH Aachen University presented at the Mobile World Congress (MWC), the world's biggest mobile fair, on February 27, 2018 in Barcelona. The Mobile World Congress is held in Barcelona from February 26 to March 1. / AFP PHOTO / Pau Barrena (Photo credit should read PAU BARRENA/AFP via Getty Images)
