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Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

Nearly 10,000 CreateOn Crayola-branded pip-Cubes were recalled on Thursday, Dec. 4, for posing an "ingestion hazard" to children, according to the U.S. Consumer Product Safety Commission (CPSC). The ...