In 1531 a "Lady from Heaven" appeared to Saint Juan Diego, a poor Indian from Tepeyac, a hill northwest of Mexico City. She identified herself as the Mother of the True God and instructed him to have ...

Abstract: Fifth generation (5G) mobile communication systems have entered the stage of commercial deployment, providing users with new services, improved user experiences as well as a host of novel ...

Can you chip in? As an independent nonprofit, the Internet Archive is fighting for universal access to quality information. We build and maintain all our own systems, but we don’t charge for access, ...