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The Smithsonian’s National Zoo, in Washington, D.C. has announced one of its elephants is pregnant, the first time a baby elephant will be born at the zoo in 25 years. The zoo says 12-year-old Nhi ...

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, these ...